172 



..ENTWICKLUNGSPHYSIOLOGIE DER TIERE" 

 1953 



bij F. Seidel Sammlung Goschen, 



I Ei und Furchung (126 pp. with Band 1 162 and 1 163 



29 figs in text) Walter de Gruyter & Co. 

 II Korpergrundgestalt und Organ- Berlin 



bildung (159 pp. with 42 figs pocket-book size 



in text) price: D.M. 2.40 



The author gives a general survey of the causal analysis of the animal 

 development in a very concise form, and synthesizes the facts obtained in 

 the various groups of the animal kingdom to more general concepts. 



Mostly, classical experiments are taken as examples, the most recent 

 development not always including. The discussion is mainly restricted to the 

 more principal facts, omitting the finer details and controversies, so that this 

 pocket book actually forms only an introduction into the field of experimental 

 embrvology. As such it is very successful and very useful for students interested 

 in this field of science; the more since it has been very clearly written, and 

 since these editions are very cheap, so that they are within the means of 

 every student. 



A fortunate idea forms the concise chapter : explanation of terms and 

 concepts. The replacement of the normal list of references by a very short hst 

 of handbooks and review articles as keys to the literature has the disadvantage 

 that students are not directly stimulated to read the original literature. It 

 might have been better when the systematical register would have been replaced 

 by an extensive list of references. 



P. D. NIEUWKOOP 



„THE FROG. ITS REPRODUCTION AND DEVELOPMENT" 



1951 



by R. Rugh The Blackiston Cy, Inc. 



336 pp. with circa 167 figs New York 



price: $4.25 



In the preface the author clearly justifies the appearance of an extensive 

 study on the normal development of a single form as an indispensable base 

 for an experimental approach in embryology. The american Leopard frog, 

 Rana pipiens. has been chosen since so much work in experimental embryology, 

 physiology, cytology and genetics has and can be done on this laboratory 

 animal. 



After a brief historical survey of the development of the field of science 

 called embryology, some basic theories in embryology are discussed. 



The development of the male and female germ cells, their maturation and 

 subsequent fertilization are extensively described and illustrated with many 

 figures and photographs. Then blastulation and gastrulation are extensively 

 treated, including many data on vital staining etc., after which neurulation 

 and early organogeny are discussed from a large number of diagrams and 

 figures. In the same style the major developmental changes in the early embryo 

 and larva are described. 



The second part of the book deals with the development of the individual 



