21 



"MICROSCOPIC HISTOCHEMISTRY' 



Principles and Practice 

 Second Edition, 1953 

 by G. Gomori 

 273 pp. of which 220 pp. of text 



The University of 



Chicago Press 



Price: $ 6.— 



The author makes a distinction between histochemistry and cytochemistry, 

 the first as the identification and localisation of chemical substances in the 

 tissues on a cytological scale and the second as the study of the chemical 

 organisation of the cell in general. These definitions are very desirable at the 

 beginning of this book, although they have a rather subjective character since 

 various authors give different definitions and even often use the terms as 

 synonyms. The author restricts the field of histochemistry to the identification 

 and localisation in the more or less intact cell or tissue directly through the 

 microscope. The very rapid developments of histochemistry in the last decennia 

 makes a critical survey of the methods used and their applicability highly 

 desirable and indispensable since many methods have been used too uncritically 

 and often without a sufficient knowledge of the chemical reactions on which 

 they are based. The author therefore first discusses the principles upon which 

 the various methods are based and the standards for validity of techniques. In 

 the second part the various techniques have been treated systematically. For 

 every technique the detailed preparation of the reagents and their application 

 is given. After the inorganic substances, the organic substances and in parti- 

 cular the enzymes have been discussed in extenso with a very large number 

 of references. This work therefore gives a very good survey of the literature 

 on these subjects. For many scientists in biology, medicine, veterinary science 

 and biochemistry this book will be very welcome. We therefore like to recom- 

 mend this text book with great pleasure to all embryologists and other readers 

 of the G.E.I.S., without disguising the fact that it will be impossible for any 

 author, particularly in such a young branch of science, to avoid a certain 

 subjectivity. We must, moreover, realize that in a field in which critical explo- 

 ration has begun so recently, hand books get out of date very rapidly, even 

 cannot be entirely up to date. 



P. D. NIEUWKOOP 



'FORTPFLANZUNG IM TIER- UND PFLANZENREICH" 

 Second Edition, 1951 



by J. Hammerling 

 135 pp. with 101 illustrations 



Sammlung Goschen Band 1138 



Walter de Gruyter 6 Co. 



Berlin 



pocket book size 



Price: DM 2.40 



This German pocketbook edition of the ,, Sammlung Goschen" deals with 

 the varied aspects of reproduction in plant and animal kingdom. It describes 

 our present knowledge of the process of reproduction s.s. and does not include 

 the numerous adaptations in plants and animals nor sex determination and its 

 genetical background. Particularly the morphology of the reproduction process 

 is extensively discussed and brought to the reader in a very comprehensive, but 



