20° SEMINAL VERMICULI. ie 
_ing them with itfelf; and, by extending and ex- 
panding the fibre, they effect increment. If the 
being is already an adult, if it no longer is fuf-. 
ceptible of expanfion, then all the molecules 
being unemployed in nutrition, thofe which, are 
fuperfluous are depofited in the organs’ of genera- 
tion,.and fome appropriated for propagation of the 
{fpecies ; anevent which fucceeds when the organic 
molecules of the male are mixed with thofe of the 
female in the matrix, fo that the moft analogous 
tend to approach each other, and, uniting in virtue 
of certain relations, form individual wholes, re- 
fembling, as ih miniature, the different parts of 
the two individuals in which they are modelled ; 
from all thefe individual wholes together, there 
refults a general whole, which is the embryo. 
If the organic molecules afforded by the male 
are more numerous than thofe afforded by the. 
female, or more active, the embryo will be a 
male; if the molecules of the female are more. 
numerous, it will be afemale. The greater num- 
ber derived from either will occafion the greater, 
refemblance in the embryo to the individual from. 
which it has received them. 
~ Large animals are lefs fruitful than fmall; the 
reafon is evident. The former extract fewer or- 
ganic molecules than the latter. A bull draws. 
Jefs nutriment from hay and ftraw, and confe- 
quently 
