20 



treat the subject systematically, but restricted himself to examples out of 

 various groups of animals and plants. In this respect this booklet differs rather 

 much from the corresponding edition of the "Sammlung Goschen", which 

 starts from a more elementary base and treats the subject more systematically. 

 The extensive bibliography gives an excellent survey of the literature of the 

 first half of the century, while a glossary explains and defines the terms used 

 in this booklet. We like to recommend this booklet warmly to all those students 

 and scientists interested in the problem of sex-determination as a problem so 

 closely related to genetics in general. 



^ P. D. NIEUWKOOP 



"THE EMBRYONIC DEVELOPMENT OF STURGEONS (5 spp.) IN 



RELATION TO PROBLEMS OF THEIR CULTURE" 



1954 



by T. A. Detlaf and A. S. Hinsburg Edited by S. G. Kryzhanovskii 



216 pp. with 51 figs, H pis, Published by the Acad, of Sciences 



18 tabs and 1 folding leaf of the USSR, Mosco.w, on behalf of 



the A.N. Severtsof Inst, of Animal 

 Morphol. 



This book, written in Russian, was sent to us by the publishers. We hope 

 to be able to review it in extenso in the 1955-issue. 



"DIE ENTWICKLUNG UND MORPHOLOGIE DES 

 CHONDROKRANIUMS VON MYOTIS KAUP" 

 1954 

 by H. Frick Georg Thieme Verlag, 



102 pp. with 46 illustrations Stuttgart 



Price: DM 14.40 



It is in general not the aim of the review rubric of the G.E.I.S. to discuss 

 the scientific value of a publication, so that in case of a purely scientific mono- 

 graph like this book I shall mainly restrict myself to a consideration of general 

 interest and form of this publication. It is rather unusual that a so specialized 

 study forming the third part of a more general investigation on the develop- 

 ment of the cranium in Chiroptera is published as a monograph, the more so as 

 previous studies (part I and II) have appeared as articles in related periodicals. 

 The very large number of illustrations in this "Habilitationsschrift" probably 

 forms the reason for the appearance of this work in the form of a book. Very 

 great care has been given to text and illustrations, which latter have been drawn 

 from models by an excellent artist. All has been printed upon very good art- 

 paper which explains a rather high price of this publication. 



This very careful and systematical, purely scientific study forms a valuable 

 contribution to our knowledge of descriptive and comparative embryology 

 and will certainly be received with great enthusiasm among specialists in that 

 field, for which it of course does not need any further recommendation. On the 

 other hand, it is very questionable whether it will actually receive much atten- 

 tion in wider circles of biologists, medical and veterinary scientists, since its 

 character is so very specialized. 



P. D. NIEUWKOOP 



