interest. These deal with anatomy and embryology of the human testis, 

 normal spermatogenesis, ultrastructure of sperm, and normal physiology of 

 spermatogenesis (vascular, nervous, hormonal and genetical factors). The rest 

 of the book is almost exclusively of medical interest. 



Most papers are followed by short lists of references. The book lacks an 

 alphabetical index. 



"THE CELLULAR SLIME MOLDS" 

 1959 

 by J. T. Bonner Princeton Univ. Press 



149 pp., 13 figs, and 8 pis. Price: $4.00 



In this book a comprehensive survey is given of descriptive and experimental 

 work carried out up till now on the organisms belonging to the group of the 

 Acrasiales. These interesting organisms are more and more considered to be 

 particularly useful in the study of development, and it is especially from this 

 point of view that the author summarizes the work, and tries to give an inter- 

 pretation of the facts. 



In the first chapter a short description is given of those primitive colonial 

 organisms which are often unjustly associated with the Acrasiales, and a few 

 points concerning the significance of aggregation in biology are discussed. 

 The second chapter examines the nature of the various members of the Acra- 

 siales and the mechanics of their development. The third chapter deals with 

 the various morphogenetic movements occurring during the aggregation, mi- 

 gration and culmination phases. 



Finally a chapter devoted to the problem of differentiation summarizes a 

 number of recent investigations pointing to the importance of cell-variation for 

 differentiation in these organisms. 



The book is concluded by an extensive bibliography. 



"BIOCHEMICAL CYTOLOGY" 

 2nd printing, 1958 

 by }. Brachet Academic Press 



535 pp., 190 figs. New York and London 



Price: $8.80 



The first printing of this book appeared more than two years ago, but was not 

 announced in this journal. Now that a second printing has seen the light, it 

 seems justified to make up for this omission. 



The book has grown from lectures. Its principal aim is to provide a link 

 between the more or less separate disciplines of cytology, biochemistry and 

 genetics in the form of a handbook. The author himself warns the reader to 

 regard the contents of his book with caution, since it deals with recent rather 

 than well-established facts and ideas. On the other hand, the name of the 

 author warrants the most up-to-date treatment of the subject matter. 



The chapter which is of most interest to embryologists is the one dealing with 

 "the nucleus and the cytoplasm in embryonic differentiation" (82 pages). It is 

 preceded by chapters on the cytoplasm and nucleus of the resting cell, on 

 mitosis, nucleic acids in heredity and protein synthesis, and nucleocytoplasmic 

 interactions in unicellular organisms. The book is opened by brief historical 

 and technical surveys, and closed by a short chapter on cancer cells, and a 



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