246 THE CELL 



they have reached maturity, as has been observed by Flemming 

 and Hermann in Salamandra maculata, and by myself in Ascaris 

 megalocephala. The framework of the nuclei disintegrates, and 

 the nuclein collects together into a compact mass, which is re- 

 markable for its strong affinity for the most various stains. The 

 protoplasm diminishes in quantity, in proportion to that present 

 in similar normal germ cells. Such a stunted cell with a com- 



Fia. 136. A Sperm cell with a degenerated nucleus from the testis of a Salamandra 

 maculata (from Flemming, PI. 25, Fig. 51 a). B Eosiduary body (corps r&siduel) from the 

 testis of Ascarit megalocepTiala. Nuclear degeneration. 



pletely disorganised nucleus is depicted in Fig. 136. A is a 

 germinal cell from the testis of Salamandra; B, a germinal cell 

 of Ascaris, such as is found both in the testis and ovary, and 

 which is known by the name of corps residuel, or residuary body. 

 Wasielewski, by injecting turpentine into the testes of mammals, 

 has succeeded in inducing experimentally a similarly degenerated 

 condition in the nuclei of germ cells. 



Concerning the physiological importance of the nuclear division processes, 

 compare Chapter IX., section 3, especially that portion dealing with the equal 

 distribution of the multiplying inherited mass amongst the cells proceeding 

 from the fertilised egg. 



Literature VI. 



1. JULIUS ARNOLD. Ueber die Theilungsvorgange an den Wanderzellen. 



Archiv fur mikroskop. Anatomie. Bd. XXX. Ferner mehrere Aufsatze 



in Virchow's Archiv. Bd. XCIIL, XCVIIL, GUI. 

 2A. AUERBACH. Orgauologische Studien. Zweites Heft. "Ueber Neubildung 



und Vermehrung der Zellkerne. 

 2B. AUERBACH. Zur Kenntniss der thierischen Zellen. Sitzungsber. d. kgl. 



preuss. A kademie der Wissenschaften zu Berlin. 1890. 

 3. BALFOUR. A Treatise on Embryology. London. 1880. 

 4A. VAN BENEDEN. Eecherches sur la maturation de Vceuf, la fecondation, et la 



division cellulaire. Archives de biologie. Vol. IV. 1883. (Trans, by 



Cunningham, Q.J.M.S., Jan., 1885.) 



4s. VAN BENEDEN u. NEYT. Nouvelles recherches sur la fecondation et la divi- 

 sion mitosique chez I'ascaride mtgalocephale. Leipzig. 1887. 



