REPRODUCTION. 



169 



network of protoplasm. Passing down the tube, the large 

 cells, which can now be recognised as eggs, arrange themselves 

 in a single row, to the number of about twenty. They are at 

 first polygonal or squarish, but gradually become cylindrical, 

 and finally oval. Between and around the eggs the nuclei 

 gradually arrange themselves into one-layered follicles, which 

 are attached, not to the wall of the tube, but to the eggs, and 

 travel downwards with them. As the eggs descend, the yolk 

 which they contain increases rapidly, and the germinal vesicle 



Fig. 95. Ovarian Tube (acetic acid preparation), showing scattered nuclei (upper 

 figure), which ultimatelj* form follicles around the ova (lower figure). Copied 

 from Brandt, loc. cit. 



