author's abstract op this paper issued 

 bt the bibliographic service, september 13 



STUDIES ON THE GONADS OF THE FOWL 



I. HEMATOPOIETIC PROCESSES IN THE GONADS OF EMBRYOS AND 



MATURE BIRDS^ 



JOSE F. NONIDEZ 



Station for Experimental Evolution, Carnegie Institution of Washi7igton 



THREE PLATES (tWENTY-NINE FIGURES) 



CONTENTS 



Introduction 81 



Material and technique 85 



Occurrence of hematopoietic foci in the gonads 86 



Origin of the extravascular granulocytes 89 



The nature of the so-called interstitial cells 95 



The fate of the granulocytes in the gonads 97 



The origin and transformations of the small lymphocytes 99 



Conclusions 104 



Literature cited 106 



INTRODUCTION 



The occurrence of a true interstitial gland in the testis of 

 the common fowl has been the subject of much speculation. 

 Strangely enough, in spite of the conspicuous differences in the 

 plumage and other characteristics of the cock when compared with 

 the similar structures of the female, the existence of such a 

 gland has never been established on a sound basis. Some 

 observers maintain that it is absent or feebly developed, hence 

 concluding that the secondary sexual characters must not 

 depend on the presence of specific glandular cells possessing an 



1 This paper is based on work done during the winter of 1920 while the author 

 was at the Department of Zoology, Columbia University. I wish to express my 

 deep indebtedness to Prof. T. H. Morgan for the abundant material put at my 

 disposal as well as for encouragement and sympathetic interest throughout the 

 work. Also to Dr. H. D. Goodale, of the Massachusetts Agricultural College, 

 Amherst, through whose kindness I was able to add to my material preserved 

 gonads of embryos and young chicks, as well as several slides showing critical 

 points in the structure of the ovary and testis. 



81 



