REVIEWS

Books reviewed in this article:
Speciation in Tropical Environments . Ed. by R. H. L owe -M c C onnell .
Determination of Angiosperm Families by means of a Punched-Card System . By B. H ansen and K. R ahn.
Numerical Taxonomy . Ed. by A. J. C ole.
Flowers of Europe—a Field Guide . By O. P olunin.
Spring Flora of Minnesota, including Common Cultivated Plants . By T homas M orley.
The Early Development of Irish Society: the Evidence of Aerial Photography . By E. R. N orman and J. K. S. S t J oseph.
Plant Pathology . By G. N. A grios.
Mycological Studies honoring John N. Couch . Ed. by W. J. K ock.
Common Edible Mushrooms . By C lyde M. C hristensen .
Fungal Parasitism . By B rian J. D everall.
The Algae—A Review . By G. W. P rescott .
An Introduction to the Principles of Plant Physiology , By W. S tiles and E. C. C ocking .
Perspectives in Phytochemistry . Ed. by J. B. H arborne and T. S wain .
Introduction to Plant Physiology . By J acob L evitt .
Root Growth . Ed. by W. J. W hittington .
Statistics and Experimental Design . By G eoffrey M. C larke .
Ecological Aspects of the Mineral Nutrition of Plants . Ed. by I. H. R orison et al.
Evolution and Phylogeny of Flowering Plants . By J. H utchinson .