12 Comparative Physiology and Psychology. [ January, 
only to that of hunger, this relativity must be borne in mind. 
The pleasurable anticipation of eating is a memory, the physical 
basis of which in the Amceba is a motion of the molecules in- 
volved in assimilation; their activity, their tension (the hungry 
Ameeba is always more active than when fed). The reproductive 
excretory is in the Amceba scarcely to be called a desire, so 
dependent is it upon the performance of the assimilative act. 
The desire is invoked in exact proportion to growth from assimi- 
lation, provided other means of consumption of this growth are 
not operative. 
This is obvious throughout all animal life. When hunger is 
extreme the sexual desire is absent. Full meals sometimes ex- 
cite voluptuous feeling. The repression of this excretory desire 
for a time becomes painful until readjustment enables vicariation. 
The desire to excrete the sperm cell is the male peculiarity, the 
desire, when present, of the female being, as shown in the Science 
article, identical with hunger. It is the hunger of the ova which 
are part of the female and which by differentiation have come to 
be capable of satisfaction in the manners to which they have 
grown. 
From the anaha stage, with its denser envelope preventing 
the escape of the cells for a longer period this sexual excretory 
desire would increase differentiation of the sexual hunger from 
the general hunger, is shown in the Drysdale and Dallinger 
monad. 
C. M. Hollingsworth! on the “ Theory of Sex and Sexual Gen- 
esis,” assigns causes determining sex: “Since germ cells are 
large and sperm cells are small, it may be at once inferred that 
where they are formed in different parts of the organism, the 
parts in which germ cells or their producing organs are formed, 
must be parts in which the conditions are especially favorable to 
nutrition; and that the parts in which sperm cells or their pro- 
ducing organs are found, must be relatively unfavorable to nutri- 
tion and favorable to cell division.” 
“The hypothesis is that a relative preponderance of the condi- 
tions on which cell division depends causes the formation of the 
female or pale generative organs,.or determines the sex of the 
individ 
Bateadine this to the Amceba the pure relativity of sex is seen. 
1 AMERICAN NATURALIST, July and August, 1884. 
PE E E EE ae ES T A E rE Be rl TE aÀ EA; ETORAS 
