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New Books. 



An Introduction to Practical Bacteriology, based upon the 

 methods of Koch. By Edgar M. Crookshank, M.B., 

 E.H.M.S. (London, H. K. Lewis.) 



It is only a few years since the discovery was made that 

 certain diseases were marked by the presence of specific forms 

 of Bacillus, and already the study of these organisms has grown 

 into a science — " Bacteriology " — the introduction to which 

 science is sufficiently far advanced to furnish matter for a 

 volume of some 250 pages. This volume is only an introduction 

 in the sense that we are as yet but just beginning to know 

 something of the subject. The book is really a complete and 

 exhaustive treatise on all that is at present known of the 

 history and classification, and of the modes of cultivating and 

 studying the Bacteria. It is illustrated with numerous wood- 

 cuts, and also with thirty beautifully-executed plates, drawn 

 by the author and his wife, most of the plates being coloured, 

 and showing the appearance of the different species as seen by 

 the unaided vision, and also under the microscope. 



The first part of the book is devoted to descriptions of the 

 apparatus employed for sterilizing the instruments and nutrient 

 materials, the isolation and cultivation of the various species, 

 the examination of the living organisms, and the various 

 methods of staining and permanently preserving them. It also 

 explains the method of experimenting upon living animals, and 

 testing the result of such experiments. 



The second part of the book comprises the history and classi- 

 fication of all the known genera and species of Bacteria, and an 

 appendix contains a description of some of the yeast fungi and 

 moulds. 



The experiments of Dr. Cantani, of Naples, and Dr. Salama, 

 of Pisa, will probably give a fresh impetus to the study of the 

 science of Bacteriology ; and those who are disposed to take up 



