GENERATION OF ANIMALS 



is to be traced back to the innermost source of the sex-dififer- 

 organism, viz., the heart : the sexual organs may serve ^nce is the 

 as an outward expression of the difference, but the 

 difference is not due to them. Like the blood, of which 

 it is a more fully concocted form, semen derives its 

 character primarily from the heart, where the blood is 

 pneumatized and charged with the requisite specific 

 " movements " (see § 63 and G.A. 737 a 19). Semen, 

 therefore, like blood, is the vehicle of " Soul," and 

 especially so in virtue of the Sv/x^vrov Ilveu/ia which 

 it contains, for SvV<Ai""ov Ilvevfia is the physical sub- 

 stance with which Soul is most intimately " associated." 

 In terms of Soul, the difference between semen and 

 menstrual fluid is that semen possesses the principle of 

 sentient Soul, menstrual fluid possesses only nutritive 

 Soul (potentialh) : the fiuid has not been charged with 

 the " movement " proper to sentient Soul owing to 

 deficiency of heat in the female. The other " move- 

 ments" in these generative residues are a most important 

 factor in the determination of generic, specific, sexual, 

 and even individual characteristics : see the discussion 

 in G.A. IV. 766 a 13 ff., 767 b 15 flF. 

 (69) It should be noted that the heat both of blood and of Heat of 

 semen (the concocted residue of blood) is not inherent, l^'ood and 

 but is acquired from a source other than themselves, ^o"^.*" 

 The logos of blood, it is true, includes the term " hot," herent but 

 but only in the same sense that the logos of " boiling "acquired.' 

 water " (if we had one word for that as we have for 

 blood) would include the term " hot." In other words, 

 the permanent substratum of blood is not hot ; and 

 thus, although in one way blood is " essentially " hot, 

 in another way it is not " essentially " hot {P. A. 649 b 

 21 ff.). Similarly, the " matter " of semen is " watery " 

 (/.(?., the substratum of it is the Element Water; cf. 

 736 a 1 and preceding passage) ; and its heat is a 

 supplementary acquisition {eiriicnp-os : G.A. 747 a 18, 

 rf. 750 a 9, 10). The explanation of these statements, 

 as will be obvious from the preceding sections, is that 

 blood is produced by the heat of the heart out of the 

 fluid matter supplied by the stomach from the food 

 (§ 63), and semen of course has to undergo still further 

 concoction bv the vital heat in the appropriate parts 

 (§ 62). 



Ixvii 



