1230 LIFE : OUTLINES OF GENERAL BIOLOGY 



apparently permanent activity of infusorians has often also its 

 resting phase. It is thus no wonder that we find the like alternation 

 continued in the characteristic sex-cells of the cryptogams; and 

 even with traceable continuity in those yet more cryptic super- 

 cryptogams, the flowering plants, which deceived botanists in 

 calling them "evident-flowering" and thus Phanerogams, though 

 really the very opposite. The importance of heredity through sex- 

 cells especially, has also too much and long eclipsed the associated 

 contrast in the vegetative life; for (as pointed out already) this 



VDI 



vn 



VI 



IV 



in 



m ^ 



^ 



s^m 





■■; ;*v^n> 



Mv:»V.? 



Fig. 196. 



Diagram Illustrating the Cell-cycle. E, predominantly encysted; C, ciliated 

 or flagellate; A, amoeboid. I, II, and III, in Protozoa; IV, ovum and 

 sperm-cell of fern prothallium; V, three animal cells — encysted, ciliated, 

 and amoeboid; VI, ciliated animal cell pathologically becoming amoeboid; 

 VII, typical sperm and amoeboid sperm as in many crustaceans; VIII, 

 amoeboid ovum as in Hydra and encysted ripe ovum. 



also has its more growing and feminoid individuals, varieties, 

 species, and more; and these in contrast to correspondingly more 

 katabolic and masculoid variations. This contrast of anabolic passi- 

 vity in growth with activity relatively more katabolic, is again 

 traceable throughout orders, classes, and phyla, and obviously 

 underlies the main division, of Vegetabilia and Animalia. Yet these 

 were rightly united by Linnaeus, in truly biologic spirit, as Organisata ; 

 and still, despite all their vast differences, expressing their origin 

 from Protistan forms not clearly classifiable as plants or animals, 

 since presenting, in their cell-cycle, the main characteristics of both.^ 

 Given this cell-cycle, have we not here a clue towards inter^ 



