GENERATION OF ANIMALS, IV. iii. 



simultaneously, and the opposite of " male " is 

 "female" and the opposite of "father" is "mother," 

 departure from type always being into f»pposites." 

 But (2) if the movement that comes from " the 

 male " gains the mastery and the movement that 

 comes from Socrates does not, or the other way 

 round, then the result is that male offspring taking 

 after their mother are formed and female ones 

 taking after their father. Supposing (S) the move- 

 ments relapse : if (i) the male " faculty " stands fast 

 but the movement from Socrates ^ relapses into that 

 of his father, then the offspring will be male and 

 take after its grandfather or some other more remote 

 ancestor [according to this principle] ; if (ii) the 

 male-faculty gets mastered, the offspring will be 

 female, and usually will take after the mother ; 

 but supposing this movement also relapses, it will 

 take after the mother's mother or some other more 

 remote ancestor on the same principle. Precisely 

 the same scheme holds good with the various parts 

 of the body ; very often, of course, some parts take 

 after the father and some after the mother, and 

 others after some of the ancestbrs, since the move- 

 ments belonging to the parts '^ as well are present 

 in (the seminal substance), some of them in actual- 

 ity, some potentially, as has often been stated. We Absence of 

 must lay down as general principles that which we r*™*^- 

 stated just now, for one (viz., that some of the biance. 

 movements are present in <the seminal substance) 

 potentially, others in actuality), and also two others : 

 (a) that which gets mastered departs from type and 

 passes into its opposite ; (6) that, however, which 

 relapses passes into the movement next to it in 

 order : if it relapses a httle, into the movement 



409 



