138 



THE EVOLUTION OF SEX. 



corpuscles" (centrosomata) in the protoplasm, which serve as "points of 

 insertion" for protoplasmic threads, which exert a "muscular action" upon 

 the nuclear elements in the forthcoming division. Boveri has traced with great 

 care the history of a special kind of protoplasm (what he calls the archoplasm), 

 which has its center in either " central corpuscle " (e), and sends out contractile 



Fig. 46. 



fibrils (_/), which moor themselves to the nuclear elements. The movements of 

 the latter during the forthcoming first division of the ovum are directly referable 

 to the antagonistic action of these fibrils, and thus we have hints of an 

 intracellular muscularity, the thought of which makes one dumb. 



