SPERMATOGENESIS— INSEMINATION 173 



Schiveigger-Seidel ^ and La Valette St. George ^ 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. 



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

 Arch. f. Mih: Anat., vol. i., 1865. 



^ La Valette St. George, " Dber die Genese der Samenkbrper," Arch. f. 

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



