Plate XIV 



(0 



(8) 



(9) 



(10) 



Spermatogenesis of the Hornet (after MEVKS, from the Author's Determination 

 of Sex), (i) Sperm mother-cell. (2-6) Abortive division of the nucleus, 

 resulting in the separation of a piece of protoplasm above, but leaving the 

 whole nucleus in the larger (lower) cell. (7-10) Normal division of the 

 large cell into two daughter-cells, each of which gives rise to a sperma- 

 tozoon. 



