40 



aim to discuss these principles on the basis of what is known about the 

 epidermal cell of Rhodnius. 



The six chapters of the book are entitled respectively: The epidermal cell; 

 The capacity for differentiation; Hormones and the control of growth; 

 Hormones and the control of form; Polymorphism; The integration of growth. 

 Much of the material presented is to be found already in the author's book 

 "The physiology of Insect metamorphosis" of 1954, and is presented here 

 only in brief outline. The stress is on general conceptions which may be vahd 

 also for other organisms. Particularly in the last chapter a number of interes- 

 ting theoretical speculations are presented, concerning biological organization 

 in general. 



Many of the illustrations, particularly among the photographic plates, are 

 not to be found in the older book. This well-printed book is concluded by a 

 bibliography of 120 titles and a short alphabetical index. 



"NATuRLICHE MEHRFACHBILDUNGEN AN 



FROSCHEXTREMITATEN" 



1959 



by A. A. Woitkewitsch Gustav Fischer Verlag 



82 pp., 56 figs. Jena 



(paper bound) Price: 16.85 DM 



This monograph, translated from the Russian, contains careful descriptions 

 and extensive discussions of a peculiar class of anomalies, concerning 

 exclusively (!) the right hind limb region of the frog Rana ridibunda. The 

 extensive material which forms the basis of the monograph was collected from 

 a number of similar, but partly unconnected mountain waters. The anomalous 

 animals were sometimes found in very large numbers. The phenomenon is 

 probably not hereditary. It may be connected with developmental retardation 

 owing to low temperatures. 



One of the 1 1 chapters deals with the development of these anomalies, while 

 another one reports on some regeneration experiments on anomalous limbs. 



The book contains a large number of photographs and drawings. It is 

 concluded by a bibliography of more than 200 titles. 



"CONGENITAL MALFORMATIONS" 

 1960 



Editors: G. E. W. Wolstenholme and J. & A. Churchill Ltd. 

 C. M. O'Connor London 



(A Ciba Foundation Symposium) Price: 45 s. 



308 pp., 90 figs. 



This book is particularly of interest to those engaged in research on mamma- 

 lian (more especially human) congenital abnormalities. The Symposium on 

 which it reports took place in January of this year, with the participation of 29 

 scientists, 18 of which came from the United Kingdom. The majority of the 

 participants work in medical institutes, and as might be expected, the main 



