The Piccolyte Resins as Microscopic Mounting Media

A new series of synthetic resins, the “Piccolytes” (β-pinene polymers), is recommended for permanent mounting media in histological work. These resins, which are available with various melting points, are of correct refractive indices, very low acid numbers, are pale, non-yellowing, have good adhesion to glass, and are freely soluble in xylene. Of a considerable variety of newer synthetic resins which were tried (stimulated by the recent scarcity of Canada balsam), only these terpene resins were found entirely satisfactory. Being of controlled manufacture, they are uniform in characteristics as well as readily available and very cheap.

A partial review of the literature of synthetic resin mountants is included.     

How Hydrogeology has Shaped the Ecology of Missouri's Ozark Cavefish, Amblyopsis Rosae, and Southern Cavefish, Typhlichthys Subterraneus: Insights on the Sightless from understanding the Underground

Two troglobitic fishes of conservation concern that inhabit Missouri are the Ozark and southern cavefishes, Amblyopsis rosae and Typhlichthys subterraneus, respectively. These species inhabit the groundwater of karstified bedrock in the Springfield and Salem plateau regions of the state, respectively. These two areas differ substantially – geographically, geologically, and hydrologically. This paper explores how these differences interact in shaping (1) the habitat in which these two species dwell, (2) the resulting ecological constraints that the fishes face, (3) how their ecologies and populations reflect these constraints, and (4) how conservation and management efforts may need to be tailored to best compliment the unique challenges that each species presents.