1 



* 



a, 



m 



^>K 





Fig. 11. Intimate Processes in the Union of Two Reproductive Cells from Photo- 

 graphs of Ascaris, all but b,. with an initial magnification of 1,500 diameters, a. A sperma- 

 tozoon. 6. A spermatozoon in the egg very highly magnified, c. Male and female nuclei after 

 assuming the resting stage, d. Male and female nucleus coming out of the resting stage, the 

 chromatic threads assuming definite shape, e. The threads from two nuclei being pulled to- 

 gether. /. A late stage of the same process, g. The completion of the process, h and i. Two 

 eggs in the stage presented by g, but seen from one of the poles of the egg: two of the threads 

 shown in both h and i are derived from the father and the other two from the mother. 



