GROWTH OF THE GERM-CELLS 



cytoplasm, of which they form henceforward a definite and 

 integral part, of great importance, as we shall see^in the early 

 differentiation of the embryo. The spindle of the first matura- 



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FIG. 6. Metamorphosis of the spermatid into the spermatozoon in the 

 Salamander (after Meves). 1-6, the whole cell ; 7-9, the anterior end ; 

 10-13, the posterior end of the head. 



tioii division and the heterotypic chromosomes, which are 

 derived from only a very small part of the contents of the 

 nucleus, go to the surface and the two maturation divisions 

 occur. Whereas in the male these divisions are equal, in the 

 female they are very unequal. By the first the first polar body, 

 by the second (which is homoeotypic) the second polar body, 



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