146 



ALICE M. BORING. 



For these measurements, I used slides from the testes of four 

 Barred Plymouth Rock cockerels of about the same age, killed 

 on the same day, all in active spermatogenesis. The measuring 

 was done with an eyepiece micrometer. One hundred seminal 



FIG. 3. Section of testis of c? 666, showing small tubules and wide spaces. 

 X 100. ABC = one triangle in which the cells were counted, such as Fig. 5 

 represents. 



tubules were measured in each of the four birds, and 100 spaces 

 between tubules. There seems to be no accurate way to measure 

 the triangular spaces. 



FIG. 4. Section of testis of cf 147. showing large tubules and narrow spaces. 

 X ioo. 



