SPERMATOGENESIS OF THE CHICKEN 71 



EXPLANATION OF FIGURES 



The photomicrographs of plates 1 and 2 were made with a Leitz y^ oil immersion 

 and 6 ocular, and enlarged in the taking so that they give a magnification of 1150. 

 Those of plate 3 were made with a Zeiss 2 mm. objective and 6 ocular, giving a 

 magnification of 750. The drawings of plates 4 to 6 were made with a camera 

 lucida, at the level of the table, and with a x^ oil immersion, and 12 compensating 

 ocular, no reduction. Figures 1 to 85 inclusive, both photographs and drawings 

 are from smear preparations fixed in Bouin and stained in iron hematoxylin. Fig- 

 ures 86 to 91 are of aceto-carmine preparations. The photographs were made by 

 Mr. Royden L. Hammond. 



