GENERAL ANATOMY. 



Si 



the peculiar hereditary substance (as observations upon 

 fertilization seem to show), while the achromatin plays a 

 role in cell multiplication. 



FIG. 20. Cell division according to Rabl. (Skin of Salamandra maculosa.) 



Cell Budding. - - Cell multiplication is undoubtedly 

 brought about chiefly by division, and usually indeed by 

 binary division. On the surface of the cell there appears 

 a circular furrow which, deepening, cuts the cell into two 

 equal parts (Fig. 20). 

 (Division in the narrower 

 sense.) Less frequently 

 cell budding (gemma- 

 tion) takes place, in the 

 course of which a large 



mother-cell cuts off from 

 itself one or more daugh- 

 ter-cells (Fig. 21). For 

 a lon time there was a 



concernng 



controversy 



4-1-.G K1->-iwiV->i- <~,f fli<= mi FlG - 2i. /'</</. //irj'rt g. mm i para with buds, a 

 the DeiiaVlOl Ol constricting off and becoming swarmers (i>); TV, 



cleus; some investigators nucleus - 



affirmed that the nucleus disappeared previous to the 

 division, and that in each daughter-cell a nucleus was 

 formed anew ; other investigators believed that the nucleus 

 was cut in two analogously to the cell. Although the first- 



