2 40 C I LIAR Y A CTION. 



with this question the structure of the spermatozoon is of 

 great interest. In both cases the movements are due to 

 changes in the bioplasm. All the wonderful powers of the 

 spermatozoon probably reside in the minute speck of bio- 

 plasm enclosed in the body or head. This I have figured 

 in one of my plates.* 



* "On Kidney Diseases, Urinary Deposits, and Calculous Dis- 

 orders." Plate X, page 330. 



