Glossary. 215 



distinguished from characters produced and potentially present from 



the first by a union of two masses of germ-plasm — plasmogenetic 



characters (q. v.). 

 Somato-plasm. — See p. 32. 

 Specialized congenital characters. — See p. 65. 

 Spermatheeae. — Organs for the storing of the seminal fluid received in 



copulation. 

 Spermatogenesis. — The precise development of spermatozoa. 

 Spermatozoa. — The essential elements in the male seminal fluid, and 



secreted by the testis — the male reproductive gland. 

 Stirp (Galton).— See p. 58. 

 Telegony. — See p. 141. 

 Unicellular Organisms. — Organisms composed of a single cell only, 



as distinguished from those consisting of aggregations of cells — 



Multicellular organisms. 

 Vertebrata. — Animals with a backbone and a ventral heart 

 Vestigial Organs. — See Rudimentary organs. 

 Xenia. — See p. 141. 



