SPERMATOGENESIS INSEMINATION 



173 



Schweigger-Seidel l and La Valette St. George 2 were the first 

 to prove, independently but almost simultaneously, that the 



FIG. 46. Human spermatozoa on the flat and in profile. (After Bramman, 

 from Schafer.) x 2500. Those on the right have adhering protoplasm. 

 The tail is only partly shown in the two seen in profile. 



1 Schweigger-Seidel, " Uber die Samenkorperchen und ihre Entwickelung," 

 Arch. f. Mikr. Anat., vol. i., 1865. 



2 La Valette St. George, " Dber die Genese der Samenkorper," Arch. f. 

 Mikr. Anat., vol. i., 1865. 



