54 



BIOLOGICAL LECTURES. 



bodies (one or more of which apparently take part in forming the 

 centrosome) do not appear to be merely thickenings of the cyto- 

 plasmic threads (this, you remember, is an essential element of 

 Watase's theory); on the contrary, many of them appear to be 

 scattered throughout the cytoplasm in a relatively independent 



Fig. 5. — Optical section through entire egg, showing telophase of second maturation spindle and 

 head of spermatozoon forming male pronucleus. Male attraction sphere has disappeared. 

 Egg attraction sphere has nearly disappeared (microsomes not represented). 



way. They vary, too, greatly in size, some of them being rela- 

 tively very large and unmistakably independent of the cyto- 

 plasmic network, but, as no exact distinction can be made as to 

 size and they all stain alike, I do not feel justified in assuming 

 that the smallest ones and the largest ones are of different 

 origin, though many of the smallest ones appear to be imbedded 



