276 APPENDIX. 



French's Butterflies of the Eastern United States. $2. (J. B. 



Lippincott Co., Philadelphia.) 



Stoke's Microscopical Praxis. $1.50. (E. Bigelow, Portland, Conn.) 

 Darwin's Vegetable Mould and Earthworms. $1.50. (D. Appletoii 



& Co., New York.) 

 Tryoii's Structural and Systematic Conchology. (Obtainable through 



the Academy of Sciences, Philadelphia.) 

 Coues's Key to North American Birds. $7.50. (Estes & Lauriat, 



Boston.) 

 Mivart's American Types of Animal Life. $2. (Little, Brown, & 



Co., Boston.) 

 Wilder and Gage's Anatomical Technology. $4.50. (A. S. Barnes 



& Co., New York.) 



Chadbourne's Instinct. $2.50. (G. P. Putnam's Sons, New York.) 

 Morgan's Animal Life and Intelligence. $4. (Ginn & Co., Bos- 

 ton.) 

 Davie's Nests and Eggs of North American Birds. (Oliver Davie & 



Co., Columbus, O.) 

 Davie's Methods in the Art of Taxidermy. The best book of its 



kind that has yet appeared. (Oliver Davie & Co., Columbus, O.) 

 Bates's Naturalist on the Amazons. $1.50. A zoological classic. 



(Roberts Bros., Boston.) 



REAGENTS. 



The following reagents and mounting media should be kept in 

 well-stoppered bottles, always available for use. They should be used 

 sparingly; but a quantity of any reagent, once used, should never be 

 poured back into the stock bottle. 



Normal Salt Solution. This is a f-per-cent solution of common 

 salt in water. It is useful as a mounting medium in which to exam- 

 ine, microscopically, fresh tissues, which w T ould, like blood corpuscles, 

 be destroyed by the osmotic action of pure water. 



Magenta. A strong aqueous solution. This is useful for staining 

 fresh tissues for microscopic examination. 



Methyl Green. A strong aqueous solution, improved by the addi- 

 tion of 1 per cent acetic acid. This is a good and permanent stain 

 for either fresh or preserved tissues. It stains nuclei deeply, and is 

 therefore very useful for examining amoeba, pararnecium, etc. 



Hydrochloric Acid. Diluted with water, this is very useful for 



