ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 121 



on Koch's view will be futile. Sir W. Smart, who had much experi- 

 ence of cholera during the Crimean war, remains under the impres- 

 sion that some such organism, if not the comma-bacillus, may yet 

 be discovered, and proved by experiment to be the specific cause of 

 cholera in man, but the present evidence is insufficient. Dr. Suther- 

 land insists on the necessity of sanitary improvement, if cholera 

 is to be successfully fought against. 



Crookshank's 'Practical Bacteriology.'*— Dr. E. M. Crookshank 

 has produced a most excellent book on Bacteria, which notwithstand- 

 ing the number of works dealing with the subject, will occupy a 

 distinct place of its own in regard especially to the practical side of 

 bacteriology, to which the bulk of the book is devoted. We know of 

 no book which any one desiring to appreciate the present position of 

 bacteriology could more usefully study, whether he intends to follow 

 up the subject by practical demonstrations of his own or otherwise. 

 The coloured plates, of which there are twenty-seven, add largely to 

 the comprehension of both the methods and their results.f There 

 are also numerous woodcuts. 



The book is divided into the following principal heads: — 

 (1) Apparatus, material, and reagents employed in a bacteriological 

 laboratory. (2) Microscopical examination of bacteria in liquids, in 

 cultivations on solid media, and in tissues. (3) Preparation and staining 

 of tissue secretions. (4) Preparation of nutrient media and methods 

 of cultivation. (5) Experiments upon the living animal and examina- 

 tion of animals experimented upon. The preceding forms Part I., 

 while Part II. is systematic and descriptive, with special microscopical 

 methods. 



* Crookshank, E. M., ' An Introduction to Practical Bacteriology, baaed upon 

 the methods of Koch,' xxii. and 249 pp., 42 figs, and 30 pis., 8vo, London, 1886. 

 t Plates III., IV., and V., supra, p. 25, are taken from this book. 



