28 Gen . Sub. 
GENERAL SUBJECTS. 
successive generations.” “ I lfold that a belief in the inheritance of 
acquired characters by the highly differentiated Protozoa, as well as by 
Metazoa, must be opposed, and I imagine that the phyletie modifications 
of Protozoa arise from the germ-plasma.” “ Amphimixis has arisen from 
the necessity of providing the process of natural selection with a con- 
tinually changing material, by the combinations of individual characters.” 
Amphimixis is no indispensable vital condition, no renewal of life or 
rejuvenescence ; its rare or frequent repetition in the life-history is not 
determined by its physical nature but by the conditions of life ; it is not 
more than an essential advantage in the maintenance and modification of 
species. 
Whitman, C. 0. Spermatophores as a means of hypodermic impregna- 
tion. J. Morph, iv, pp. 361-40G, 1 pi. 
