REVIEWS

Review in this article:
British Parasitic Fungi . By W. C. M oore .
Chemistry and Biology of the Starch Granule . By N. P. B adenhuizen .
Plant Pathology: an Advanced Treatise . Vol. 1. The Diseased Plant. Edited by J. G. H orsfall and A. E. D imond .
Protoplasmatologia. Handbuch der Protoplasmaforschung . Edited by L. V. H eilbrunn and F. W eber .
Papierchromatographie in der Botanik . Second edition. By N. F. L inskens and others.
Morphology and Physiology of Plant Tumours . By A rmin C. B raun and T om S tonier .
Exchange of Genetic Material: Mechanisms and Consequences . Cold Spring Harbor Symposia on Quantitative Biology, Volume 23.
Encyclopedia of Plant Physiology (Handbuch der Pflanzenphysiologie). Volume XI. Heterotrophy. Edited by W. R uhland .
The Biology of Mycorrhiza . By J. L. H arley .
Cold Spring Harbor Svmposia on Quantitative Biology . Vol. XXIV.     

REVIEWS

Book reviewed in this article:
Atlas of the British Flora . Edited by F. H. P erring and S. M. W althrs .
Handbuch der Pflanzenphysiologie: Encyclopedia of Plant Physiology . Vol. XIV: Growth and Growth Substances. Edited by W. R uhland .
Drawings of British Plants . Part XVII: Compositae (3). By S tella R oss -C raig .
Apical Meristems . By F. A. L. C lowes . Botanical Monographs, vol. 2. Edited by W. O. J ames .
Cellular Regulatory Mechanisms . Cold Spring Harbor Symposia on Quantitative Biology
Proceedings of the Summer School of Botany held June 2–15, 1960, at Darjeeling . Edited by P. M aheshwari , B. M. J ohri and I. K. V asil .
Exotic Forest Trees in the British Commonwealth . By R. J. S treets . Edited by Sir H arry C hampion .
A Flora of the Alaskan Arctic Slope . By I. L. W iggins and J. H. T homas
Grundzüge der Pflanzenanatomie . By B. H uber .
Taschenbuch der Botanik . By H. M iehe . Revised by W. M evius .
A Conspectus of Aphids as Vectors of Plant Viruses . By J. S. K ennedy , M. F. D ay and V. F. E astop .
Crop Adaptation and Distribution . By C arroll P. W ilsie .
Flora of Cultivated Plants of the U.S.S.R. Vol. XIII: Perennial Leguminous Plants: Medicago, Melilotus and Trigonella. Edited by E. N. S inskaya . Translated by N. L andau .
Der Federsee . Edited by W. Z immermann .
Carbohydrate Resources within the Perennial Plant . By C. A. P riestley .
Flora of the British Isles . By A. R. C lapham , T. G. T utin and E. F. W arburg .
Mineral Salts Absorption in Plants . By J. F. S utcliffe .
The Development of British Heathlands and their Soils . By G. W. D imbleby .
Annual Review of Plant Physiology , vol. 13. Edited by L. M achlis and W. R. B riggs .     

REVIEWS

Panbiogeography . By L eon C roizat .
Evolution of Genetic Systems . By C. D. D arlington
Les Urédinées (ou Rouills des Végétaux) . Tome 3. Genre Uromyces. By A. L. G uyot
Comparative Morphology of Vascular Plants . By A driance S. F oster and E rnest M. G ifford , J r
Die Frühdiagnose in der Züchtung und Züchtungsforschung: Beitrage zur Methodik der Zuchtung langlebiger Pflanzen . Edited by H. S tubbe and W. S chmidt
On Jurassic Taxads and Conifers from North-Western Europe and Eastern Greenland . By R udolf F lorin
Nutrition of the Legumes . Proceedings of the University of Nottingham Fifth Easter School in Agricultural Science, 1958. Edited by E. G. H allsworth
Taschenbuch der Botanik (begrundet von Hugo Miehe). Vol. II, Systematik . By W alter M evius
Cytology and Cytogenetics . By C. P. S wanson
Lower Miocene Pollen Flora from the valley of Klodnica near Gliwice (Upper Silesia) . Published in Publications of the Scientific Society in Wroclaw, Series B, No. 88 (Prace Wroclawskiego Towarzystwa Naukowego). Wroclaw 1957, by S. M acro
Cold Spring Harbor Symposia on Quantitative Biology . Vol. XXII. Population Studies: Animal Ecology and Demography.
Handbuch der Pflanzenphysiologie . Edited by W. R uhland . Band VIII: Der Stick-stoffumsatz     

REVIEWS

Review in this article:
Protoplasmatologia—Handbuch der Protoplasmaforschung . Band II, CI. The Viscosity of Protoplasm. By L. V. H eilbrunn .
Trace Element Problems in Nature . A Symposium in the Botany Department, University of Cape Town. Edited by D r . K. H. S chütte .
Cell, Organism and Milieu. (Seventeenth Growth Symposium). Edited by D orothea R udnick .
Subcellular Particles . Edited by T. H ayashi .
Plant Growth Substances . By L. J. A udus .
Uredineana. Receuil d': études systematiques et biologiques sur les Urédinées du Globe . Tome 5. By A. L. G uyot .
A Textbook of General Physiology . By H. D avson .
Protoplasmatologia . Vol. Ill AI. Le Chondriome de la Cellule Végétale: Morphologie du Chondriome; by P. D angeard .
Analytical Cytology . Edited by R obert C. M ellors .
Blakeslee: The Genus Datura . By A. G. A very , S. S atina and J. R ietsema .
The Royal Botanic Gardens, Kew, Past and Present . By W. B. T urrill .
Drawings of British Plants . Part XIII. Umbelliferae (2), Araliaceae, Cornaceae. By S tella R oss -C raig .
Physiology of Fungi. By V incent W. C ochrane .
Illustrated Moss Flora of Fennoscandia . Vol. II. Musci. Fasc. III. By E lsa N yholm .
An Outline of General Plant Geography . By W. S zafer .
Protoplasmatologia. Handbuch der Protoplasmaforschung . Ed. L. V. Heilbrunn and F. Weber. Vol. VIII; 9a. Polaritút und Inäquale Teilung des pflanzlichen Protoplasten . By Erwin Bünning, Tübingen.     

REVIEWS

Book reviewed in this article:
The Biological Action of Growth Substances . (Symposium of the Society of Experimental Biology XI.) Edited by H. K. P orter .
Plant Vims Serology. By R. E. F. M atthews .
Illustrated Moss Flora of Fennoscandia , Vol. I. Hepaticae. By S igfrid A rnell .
Illustrated Moss Flora of Feniioscandia , Vol. II. Musci. Fasc. II. By E lsa N yholm .
Annual Review of Plant Physiology . Vol. VIII. Edited by A. S. C rafts .
Dictionary of Microbiology . By M. B. J acobs , M. J. G erstein and W. G. W alter .
The Origin of the African Flora . By A. S. B oughey .
Die Entstehung der Kulturpflanzen . By F. S chwanitz .
Die kartographische Darstellung der Vegetation des Creux du Van-Gebietes ( Jura des Kantons Neuenburg ). By M. M oor and U. S chwarz .
Le Vacuome de la Cellule Végétale. Morphologic . By P ierre D angeard .
Genetic Mechanisms: Structure and Function . Cold Spring Harbor Symposia on Quantitative Biology, Volume 21.
Handbuch der Pflanzenphysiologie (W. Ruhland, editor) Band VII. Stoffwechsel-physiologie der Fette und fettähnlicher Stoffe. By M. S teiner .
Plant Pathology. By J. C. W alkkr .     

REVIEWS

Review in this article:
Drawings of British Plants. Part XIV. Adoxaceae-Dipsacaceae . By S tella R oss -C raig .
Darwin's Biological Work: Some Aspects Reconsidered . Edited by P. R. B ell .
Flora of the British Isles, Illustrations, Part II, Rosaceae-Polemoniaceae . By A. R. C lapham , T. G. T utin and E. F. W arburg . Drawings by S ybil J. R oles .
Protoplasmic Streaming. Protoplasmatologia. Handbuch der Protoplasmaforschung . Edited by L. V. H eilbrunn and F. W eber .
The Ecology of Soil Fungi. An International Symposium . Edited by D. P arkinson and J. S. W aid .
Marine Algae of the Eastern Tropical and Subtropical Coasts of the Americas . By W illiam R andolph T aylor .
Introduction to Plant Geography . By N icholas P olunin .
Frost, Drought and Heat Resistance . By J. L evitt .     

REVIEWS

Handbuch der Pflanzenkrankheiten. Herausgegeben von Prof. Dr O. A ppel .
Third International Congress of Comparative Pathology, Athens , 1936. Reports , vol. I, part 2. Section of Plant Pathology.
The Genus Septobasidium. By J ohn N. C ouch .
Soilless Growth of Plants. By C arleton E llis and M iller W. S waney .
Plant Growth Substances. By H ugh N icol .
Common British Grasses and Legumes. By J. O. T homas and L. J. D avies .
Plant Ecology. By J. E. W eaver and F. E. C lements .
Forest Bibliography to 31st December 1933. Compiled and published by the Department of Forestry, University of Oxford.
Textbook of Dendrology. By W. M. H arlow and E. S. H abrar .
Cryptogamic Botany. By G ilbert M. S mith . Vol. I: Algae and Fungi.
Evolution. Essays on Aspects of Evolutionary Biology presented to Prof. E. S. Goodrich on his Seventieth Birthday. Edited by G. R. de B eer .
Heredity. By A. F ranklin S hull .     

REVIEWS

Review in this article:
The Grass, Fern and Savannah Lands of Ceylon, their Nature and Ecological Significance. By C. H. H olmes .
Guide to the National Pinetum and Forest Plots at Bedgebury. By W. D allimore , R. F. W ood and others. Edited for H.M. Forestry Commission by J. M acdonald and H. J. E dlin .
Elementary Genetics. By W ilma G eorge .
The Stipitate Hydnums of the Eastern United States. By W illiam C hambers C oker and A lma H olland B eere .
Leaf Analysis. By H. L undegårdh , translated by R. L. M itchell .
Trace Elements in Plant Physiology (Lotsya, Vol. 3, I.U.B.S. Colloquia, Series B., No. 1).
Respiration et Métabolisme Azoté ( Etude de physiologie foliaire ) By A lexis M oyse .
Manual of Phycology. An Introduction to the Algae and their Biology. Edited by G ilbert M. S mith .
Recent Advances in the Study of Plant Viruses. By K enneth M. S mith .
An Introduction to the Anatomy of Seed Plants. By E. L. S tover .
Drawings of British Plants. Part V. Caryophyllaceae. By S tella R oss -C raig .
Zur Lebensgeschichte des Schilfs an den Ufern der Schweizer Seen. Beiträge zur geobotanischen Landesaufnahme der Schweiz. Heft 30. By H ans H ürlimann .
Vegetationskarte der Schweiz. In four sheets, I-IV. Scale 1: 200,000. By E mil S chmid .
Native Orchids of North America. By D. S. C orrell .
Advances in Genetics. Vol. IV. Edited by M. D emerec .
Flora of the British Isles. By A. R. C lapham , T. G. T utin and E. F. W arburg .
Introduction to Mycology. By J. A. M acdonald .     

REVIEWS

Encyclopedia of Plant Physiology , vol. Ill, The Water relations of Plants . Edited by O. S tocker .
Das Leben der Gewächse . Ein Lehrbuch der Botanik.
Plants in Action . By L. M achlis and J. G. T orrey .
The Microstructure of Starch Grains . By E dith A. R oberts .
Plant Physiology . By M. T homas
Annual Review of Plant Physiology
The Metachromatic Reaction . (Protoplasmatologia. Handbuch der Protoplasmaforschung edited by L. V. Heilbrunn and F. Weber. Band II D 2.) By J. W. K elly .
Die Biologie der Bliite . By F. K noll .     

REVIEWS

Book reviewed in this article:
Botanical Histochemistry: Principles and Practice . By W illiam A. J ensen .
The Biology of Cilia and Flagella . By M. A. S leigh .
Dünnschicht-Chromatographie . Edited by E gon S tahl .
Plant Embryology. A Symposium .
The Morphology of Pteridophytes . By K. R. S porne .
Introductory Mycology . By C. J. A lexopoulos .
Residue Reviews , Vol. 1. Edited by F. A. G unther .
Energy Exchange in the Biosphere . By D avid M. G ates .
Pathology of Trees and Shrubs with Special Reference to Britain . By T. R. P eace .
Modern Methods of Plant Analysis . Vol. V. Edited by H. F. L inskens and M. V. T racey .
The Growth of Plants . By G. E. F ogg .
An Introduction to Plant Physiology . By W. O. J ames .
Die Physiologische Uhr. Zeitmessung in Organismen mit ungefähr Tagesperiodischen Schwingungen . By E. B ünning .     

REVIEWS

Book reviewed in this article:
The Rabbit . By HARRY V. THOMPSON and ALASTAIR N. WORDEN.
The Distribution and Abundance of Animals . By H. F. ANDREWARTHA and L. C. BIRCH.
Biology of the Laboratory Mouse . Edited by GEORGE D. SNELL.
Features of Evolution in the Flowering Plants . By RONALD GOOD.
Tobacco Diseases with Special Reference to Africa . By J. C. F. HOPKINS.
Bibliographie der Pflanzenschutz-Literatur 1950. Edited by J. BÄRNER.
Principles of Fungicidal Action . By JAMES G. HORSFALL.
Progress in Nuclear Energy . Series VI. Biological Sciences . Vol. 1. Edited by J. C. BUGHER, J. COURSAGET and J. F. LOUTIT.
Bacterial Diseases of Plants . By C. STAPP.
The Biology of the Heteroptera . By N. C. E. MILLER.
Man's Role in Changing the Face of the Earth . Edited by W. L. THOMAS.     

REVIEWS

Book reviewed in this article:
A Course in Biology . By J. J. B aker and G. E. A llen .
Papers on Plant Systematics . By R. O rnduff .
Die Entstehung der Arten und hoheren Kategorien . By H. L amprecht .
Flora of Iraq , Vol. 9. Gramineae . By N. L. B or . (Ed. by C. C. T ownsend and E van G uest , with the collaboration of A li A l -R awi ).
Wild Elowers of North Carolina . By W illiam S. J ustice and C. R itchie B ell .
The Lichen Genera Cetrelia and Platismatia ( Parmeliaceae ). By W. L. C ulberson and C. F. C ulberson .
Essays on Form in Plants . By C. W. W ardlaw .
Crop Responses to Water at Different Stages of Growth . By P. J. S alter and J. E. G oode .
Protons, Electrons, Phosphorylation and Active Transport . By R. N. R obertson .
Encyclopedia of Plant Physiology, XVIII, Sexuality: Reproduction; Alternation of Generations . General editor, W. R uhland ; sub-editor for this volume, H. F. L inskens .
Annual Review of Plant Physiology , Vol. 19. 1968. By L. M achlis (Ed.).
Biophysical Technique as Applied to Cell Biology . By J. C hayen and E. E. D enby .
The Measurement of Environmental Factors in Terrestrial Ecology . British Ecological Society Symposium No. 8. Ed. by R. M. W adsworth et al .
Guide to the Check Sheet for IBP Areas . IBP Handbook No. 4. By G. E. P eterken .     

REVIEWS

Book reviewed in this article:
Cell Physiology and Pharmacology . By J. E. D anielli .
Annual Review of Plant Physiology, Vol. I. Edited by D. I. A rnon and L. M achlis .
Water in the Physiology of Plants. By A. S. C rafts , H. B. C urrier and C. R. S tocking .
Elements of Plant Biology. 3rd. ed. By W. O. J ames .
Biochemie und Physiologie der sekundären Pflanzenstoffe. By K arl P aech .
A Monograph of Clavaria and Allied Genera. By E. J. H. C orner .
Les Légumineuses du Gabon. By F ranclois P ellegrin .
The Art of Botanical Illustration. By W ilfrid B lunt .
Introduction to Soil Science. By G. W. L eeper .
Amtno-acids and Proteins. Cold Spring Harbor Symposium on Quantitative Biology, vol. XIV.
Physiology of Fungi. By L ilian E. H awker .     

REVIEWS

Book reviewed in this article:
Forest Flora of Northern Rhodesia . By F. W hite , assisted by A. A ngus .
Tools of Biological Research . Edited by H edley J. B. A tkins .
Eigenschaften und Wirkungen der Gibberelline . Symposium der Oberhessischen Gesell-schaft für Nature- und Heilkunde, Naturwissenschaftliche Abteilung zu Gieszen vom I bis 3 Dezember, 1960. Edited by R. K napp .
Regeneration . Edited by D orothea R udnick .
Marsilea . By K. M. G upta .
Diseases of Sorghum, Sudan Grass and Broom Corn. By S. A. J. T arr .
Proceedings of the IX International Botanical Congress. Vol. 3. Plenary Sessions; Nomenclature .
Mutations and Polyploidy in Plant Breeding . By A rne H agberg and E rik Å kerberg .
Nitrogen Metabolism in Plants . By H. S. M c K ee .     

REVIEWS

Book reviewed in this article:
Flora Palaestina . By M. Z ohary and N. F einbrun -D othan . Vol. 1, by M ichael Z ohary .
Nouvelle Flore du Liban et de la Syrie . By P aul M outerde
Tropical Plant Types . By B. G. M. J amieson and J. F. R eynolds .
The Biology of Fungi, Bacteria and Viruses . By G reta S tevenson .
The Biology of Aquatic Vascular Plants . By C. D. S culthorpe .
Handbuch der Pflanzenanatomie . Band VIII/I. Anatomie des Blattes 1. Blattanatomie der Gymnospermen . By K lans N app -Z inn .
The Lichen Symbiosis . By V ernon A hmadjiax .
Plant Anatomy . By A. F ahn , translated from the Hebrew by S ybil B roido -A ltman .
Gymnosperms—Structure and Evolution . By C. J. C hamberlain .
Structure and Reproduction of the Gymnosperms; Fossil and Living . By B. S. T rivedi and D. K. S ingh .
An Introduction to Gvmnosperms . By S. C. D atta .
Sourcebook of Laboratory Exercises in Plant Pathology . Ed. by the Sourcebook Committee of the American Phytopathological Society (Chairman, A. K elman ).
Diffusion Systems . By M. H. J acobs .     

REVIEWS

Book reviewed in this article:
Lower Upper Cretaceous Plant Microfossils from Minnesota . By R ichard L. P ierce .
Rubber: Botany, Production and Utilization . By L oren G. P olhamus .
Manipulations de Botanique . By L. G enèves .
Chromosome Numbers of Central and Northwest European Plant Species . Opera Botanica (Botaniska Notiser supplement) Vol. 5. By A. and D. L öve .
Synthesis of Molecular and Cellular Structure . Edited by D orothea R udnick .
Contemporary Botanical Thought . Edited by A. M. M acleod and L. S. C obley .
Flora of New Zealand . Vol. I. Indigenous Tracheophyta: Psilopsida, Lycopsida, Filicopsida, Gymnospermae, Dicotyledons. By H. H. A llan .
A Review of Nitrogen in the Tropics with Particular Reference to Pastures— A Symposium . Bulletin No. 46 of the Commonwealth Bureau of Pastures and Field Crops. Edited by a Committee of the Division of Tropical Pastures, C.S.I.R.O., Australia.
Control Mechanisms in Cellular Processes . The Seventh Annual Symposium publication of the Society of General Physiologists. Edited by D avid M. B onner .
Recent Advances in Botany . From lectures and symposia presented to the IX International Botanical Congress, Montreal 1959. Vols. I and II.
Encyclopaedia of Plant Physiology . Edited by W. R uhland . Vol. XVI. External factors Affecting Growth and Development. Sub-editor: G. Melchers.
Advances in Genetics . Vol. X. Edited by E. W. C aspari and J. M. T hoday .
Soil Micro-organisms and Higher Plants . By N. A. K rasilnikov . Translated by Y. Halperin.
An Introduction to the Cytogenetics of Polvploids . By G. W. P. D awson .
Plant Pathology: An Advanced Treatise . Vol. III: The Diseased Population, Epidemics and Control. Edited by J. G. H orsfall and A. E. D imond .     

Reviews

Book Reviewed in this article:
Phloem Transport in Plants. By A. S. C rafts and C. H. C risp .
Introduction to the Fine Structure of Plant Cells. By M yron C. L edbetter and K eith R. P orter .
Symposia of the Society for Experimental Biology No. 25. Control Mechanisms of Growth and Differentiation. Ed. by D. D. D avies and M. B alls .
Plant Lipid Biochemistry. By C. H itchcock and B. W. N ichols .
Cell Respiration. By W. O. J ames .
Prediction and Measurement of Photosynthetic Productivity.
Fortschritte der Botanik , Vol. 32. Ed. by H. E llenberg , K. E sser , H. M erxmüller , P. S itte and H. Z iegler .
Stoffwechselphysiologie der Pflanzen. By G. R ichter .
Pflanzenphysiologie. By D. H ess .
Moleculare Grundlagen der Entwicklung. By H. M ohr and P. S itte .
The Diversity of Green Plants. By P eter B ell and C hristopher W oodcock .
Anatomy of the Monocotyledons. Ed. by C. R. M etcalfe . Vol. V. Cyperaceae. By C. R. M etcalfe .
Soil Micro-organisms. By T. R. G. G ray and S. T. W illiams .
Des Ovules aux Graines. By M. F avre -D uchartre .
Ecology of Leaf Surface Micro-organisms. Ed. by T. F. P reece and C. H. D ickinson .
Fungal Genetics. By J. R. S. F incham and P. R. D ay .
Étude du Mode de Reproduction: Apomixie Facultative du Point de Vue de la Génétique des Populations. (Study of Facultative Apomixis from the View-point of Population Genetics). By J. P erèns .
Drawings of British Plants ; Part XXVIII: Hydrocharitaceae, Orchidaceae. By S tella R oss -C raig .
Plants of Hong Kong. By S. L. T hrower .
An Atlas of Plant Structure , Vol. 1. By B rian B racegirdle and P atricia H. M iles .
Bioiléctricité, Quelques Problèmes. By S. M eylan .
Studying the Past by Pollen Analysis. By R. G. W est .
The Mysterious Origin of Flowering Plants. By K enneth R. S porne .     

Reviews

Principles of General Physiology. Vol. 11: General Physiology. By L. E. B ayliss
Hackfruchtkrankheiten und Nematodenforschung. Editor H. G offart.
Advances in Applied Microbiology. Vol. 1. Editor W. W. U mbreit
Advances in Applied Microbiology. Vol. 11. Editor W. W. U mbreit
Der Vielfrass (Gulo gulo L. 1758). Zur Kenntnis seiner Naturgeschichte und seiner Bedeutung für den Menschen. By P. K rott
Control of Rats in Sewers. By E. W. B entley
Introduction to Probability and Statistics. By H. L. A lder and E. B. R oessler
Methods of Testing Chemicals on Insects. Vol. 11. Edited by H. H. S hepard
The Biology of Marine Animals. By J. A. C olin N icol
The Effects of Pollution on Living Material. Edited by W. B. Y app
Taxonomy of Flowering Plants. By C. L. P orter
Bananas. By N. W. S immonds
Atlas of Bacterial Flagellation. By E inar L eifson
Diagnostik der Bakterien und Actinomyceten. By N. A. K rassilnikov , M oscow , translated into German by R. W. W ittwer and R. D ickscheit
A Review of the Biological Control of Insects and Weeds in Australia and Australian New Guinea. By F rank W ilson
The Ecology of Soil Fungi. Edited by D. P arkinson and J. S. W aid . (An International Symposium)
Introduction to Plant Geography and Some Related Sciences. By N icholas P olunin     

Reviews

The Mites of Stored Food. A. M. H ughes .
New Approaches in Cell Biology. P. M. B. W alker .
Milk: The Mammary Gland and its Secretion. Two volumes. S. K. K on A. T. C owie .
Encyclopaedia of Plant Physiology. (Handbuch der Pflanzenphysiologie.) E. R uhland .
Soil Biology. W ilhelm K ühnelt .
Insect Life and Insect Natural History. S. W. F rost .     

REVIEWS

Review in this article:
Active Transport and Secretion. Symposium of the Society of Experimental Biology. VIII. Edited by R. B rown add J. F. D anielli .
Protoplasmatologia. Handbuch der Protoplasmaforschung. Hrsg. v. L. V. Heilbrunn u. F. Weber. Band 1/1: Die makromolekulare Chemie und ihre Bedeutung für die Protoplasmaforschung. By H. S taudinger and M. S taudinger .
Flora of Egypt. Vol. III. Angiospermae, part Monocotyledons: Liliaceae—Musaceae. By V ivi T ackholm and M ohammed D rar .
Australian and New Zealand Botany. By J. M c L uckie , M.A., B.Sc. (Glas.), D.Sc. (Syd.) and H. S. M c K ee , B.A., D.Phil. (Oxon).
South African Pollen grains and Spores, Part I. By E. M. van Z inderen B akker .