106 



PHYSICAL BASIS OF HEEEDITY 



Kia. 45. — Cells emerging from the resting stages preparatory for the next spermatagonia 



division. (After Wenrich.) 



mA 



f'it 







a 



Fia. 46. — Cells emerging from their last spermatagonial division, a. b; passing into the 



synapsis stage, c, d; (After Wenrich.) 



