PREFACE 



The purpose of this book is to present the saUent facts 

 relating to sex-determination and to guide the student 

 to further reading. It presupposes that the reader al- 

 ready has a fair knowledge of genetics and cytology; it 

 restricts itself to a consideration of the cytological and 

 genetical aspects of sex-determination and does not 

 consider the problems that cluster round the actual 

 development of the sexual characters, since such de- 

 velopment pertains not to sex-determination but rather 

 to sex-differentiation. 



Those who wish to explore more fully the matters 

 touched upon in this book are advised to turn to 

 Advances in Genetics ^ edited by M. Demerec, four 

 volumes of which have been published so far in 1947- 

 195 1 by Academic Press Incorporated, New York, and to 

 The Evolution of Genetic Systems by C. D. Darlington, 

 published in 1946 by the Cambridge University Press. 

 Such as wish to proceed from a study of sex- determina- 

 tion to one of sex- differentiation can profitably refer to 

 F. H. A. Marshall's Physiology of Reproduction, third 

 edition, edited by A. S. Parkes and published in 1952 

 by Longmans, Green, London, or to Sex atid Internal 

 Secretions, edited by Edgar Allen and published in 1939 

 by Williams and Wilkins Company, Baltimore. 



^^^^^^ F.A. E. C. 



EDINBURGH 

 1953 



