250 THE EVOLUTION OF SEX. 



preserve the constancy and integrity of the species; thus, in a word, 

 the general heredity is perpetuated primarily by the female, while 

 variations are introduced by the male. Yet along paths where the 

 reproductive sacrifice was one of the determinants of progress, we shall 

 see later that they must have the credit of leading the way. The 

 more active males, with a consequently wider range of experience, 

 may have bigger brains and more intelligence ; but the females, espe- 

 cially as mothers, have indubitably a larger and more habitual share of 

 the altruistic emotions. The males being usually stronger, have 

 greater independence and courage; the females excel in constancy of 

 affection and in sympathy. The spasmodic bursts of activity charac- 

 teristic of males contrast with the continuous patience of the females, 

 which we take to be an expression of constitutional contrast, and by 

 no means, as some would have us believe, a mere product of masculine 

 bullying. The stronger lust and passion of males is likewise the obverse 

 of predominant katabolism. 



That men should have greater cerebral variability and therefore 

 more originality, while women have greater stability and therefore 

 more " common sense," are facts both consistent with the general 

 theory of sex and verifiable in common experience. The woman, 

 conserving the effects of past variations, has what may be called the 

 greater integrating intelligence; the man, introducing new variations, 

 is stronger in differentiation. The feminine passivity is expressed in 

 greater patience, more open-mindedness, greater appreciation of subtle 

 details, and consequently what we call more rapid intuition. The 

 masculine activity lends a greater power of maximum effort, of scientific 

 insight, or cerebral experiment with impressions, and is associated 

 with an unobservant or impatient disregard of minute details, but with 

 a stronger grasp of generalities. Man thinks more, woman feels more. 

 He discovers more, but remembers less; she is more receptive, and 

 less forgetful. 



V. The Love for Offspring. — Just as it is impossible to point 

 to the stage where psychical sympathies enhance the reproductive 

 impulse into the love of mates, so we can not tell where parental care 

 becomes disinterested enough to warrant our calling it love of off- 

 spring. For, as no one can be foolish enough deliberately to ignore 

 the sexual or physical basis of "love "in the higher and highest 

 organisms, so it must be allowed that even maternal care has its selfish 

 side. To take only one example, that of lactation. The unrelieved 

 pressure in the mammary glands of a mother animal robbed of her 

 young is no doubt largely concerned in prompting her to adopt young 

 ones not her own, yet we soon see these established in her affections. 

 So in normal cases, there naturally remains an alloy which prevents us 



