ORIGIN OF LIFE, SEX, SPECIES, ETC. 225 



exclusively to reproduction. It has been reported 

 by microscopists that in this, the lowest form of 

 sexual life, the male is sometimes absorbed into 

 the female organism by serving as food for it. Evi- 

 dently the segregation of the two substances has 

 made considerable progress, but has by no means 

 reached completion. 



For it is reported that in organisms of this type 

 the females sometimes reproduce without the assist- 

 ance of the males, and at other rarer occasions that 

 the males reproduce without aid from the females, 

 which would indicate, if correct, that each sex retains 

 enough of the powers of the other to go on without 

 it in case of necessity. Segregation at this stage 

 has not reached completion. Time between birth 

 and reproduction has been too short, or the pro- 

 tection against external influence has been inade- 

 quate for perfect dissociation. 



In the highest type of sexual reproduction, both 

 the male substance and female are each contained 

 in a separate organ, and each of these is specialized 

 to its own part of the reproductive process exclu- 

 sively. Each of these organs is, then, a part of a 

 well-developed individual of the race type. The 

 individuals of such races are distinguished as being of 

 male or female sex, and while each resembles the other 

 in being of the average race characteristics, in those 

 visible, bodily organs, which are composed of somatic 

 cells, they differ from each other in the parts direct- 

 ly related to reproduction. In this kind of organisms, 



