50 ZOOLOGY 



eventually, in one way or another, accommodated by 

 the rapidly extending theoretical structure. "Mendel- 

 ism," as we know it today, would astonish Mendel 

 himself, but his researches stand at the very root of 

 the growth which has sprung from the work of modern 

 experimenters. Most wonderful of all, perhaps, is the 

 confirmation and extension of the theory made possible 

 by investigations into the minute structure of the germ 

 cells, due to instruments and methods wholly out of 

 Mendel's range, belonging to a science called cytology, 

 which scarcely existed in his time. 



