21 



In the second chapter ("The function of development") attention is focused 

 on the processes leading from the small reproductive units to well-adapted, 

 relatively large individual organisms possessing division of labour among their 

 cells. Different patterning mechanisms play a role here, involving close co- 

 ordination between the parts. Parallels are drawn between many different 

 types of development, and their possible evolution is discussed. 



In the last chapter ("The extension of development") the major character- 

 istic of development, integration along with increase in size, is extended into 

 the domain of associations of individuals, and the adaptive value it has also in 

 this domain is stressed. Again a variety of examples are given, illustrating the 

 particular mechanisms of co-ordination prevailing here. Among these examples 

 are symbiosis, fertilization, mating in lower organisms, and social behaviour in 

 animals. Here the author obviously exceeds the limits of what is usually meant 

 by the word "development". 



"METHODS FOR OBTAINING AND HANDLING MARINE EGGS 



AND EMBRYOS" 



1957 



by D. P. Costello, M. E. Davidson, Marine Biological Laboratory 



A. Eggers, M. H. Fox and C. Henley Woods Hole, Mass. 



247 pp. , Price: $ 3.50 in the U.S.A. 



$ 4.00 elsewhere 



This manual compiles all the known methods for handling embryological 

 material available at the Marine Biological Laboratory, Woods Hole, Mass. 

 The information is of course also useful for investigators working at other 

 localities and with related forms not listed in the book. 



There is a short introductory chapter on general methods. The actual list 

 of specific methods is arranged in a taxonomic order, starting with the Porifera 

 and ending with the Teleosts. The total number of species hsted is 94. For 

 each species the data are arranged conveniently under a number of sub- 

 headings, and are followed by a list of references of work on the species, 

 which, although it is not complete, includes the most important relevant titles. 

 Moreover the book contains a most useful table summarizing the egg 

 characteristics of all the species (e.g. egg size, stage of nucleus at time of 

 fertilization, rate of development, jelly, secondary membranes). An alphabetical 

 index concludes the book. 



"STUDIES ON THE PASSAGE OF PHOSPHATE BETWEEN 



MOTHER AND FOETUS IN THE GUINEA PIG" 



1957 



by F. Fuchs Ejnar Munksgaard 



127 pp. Copenhagen 



Price: D.Kr. 20.00 



This is a doctor's thesis, the work for which was carried out partly at the 

 Department of Embryology, Carnegie Institution of Washington, and partly 

 at the Department of Medical Physiology, University of Copenhagen. The 

 study was performed with the aid of radioactive phosphorus. 



