[ 6 5S ] 
peculiar to itfelf, and acquired fince it paffed from 
the homogeneous Element, in which all Kinds co- 
incide. The a&ive vegetative Force that refides in it 
mull be precife, its Quantity mud be cxa&ly propor- 
tion’d to the Nature, Solidity, Tenacity, Quantity, 
and Reftftance of the ductile Matter it has to wade 
< • i r . ... 
" through, if I may fo exprefs myfclf j an$i thefe Com- 
binations are- very different in different Subjects* 
Thus much the ‘ many Strainers; in every animal 
Body, nccefiary to extra# this Semen from the All-, 
rnent we daily digeft, and to prepare it, feem evi- 
dently to imply.. Yet is not this, fufficicnt as it may 
appear to caufe Varieties in the. feveral Species of 
Semen , all that is to be confider’d Times and Cir- 
cumfiances make Changes in it even during the 
Term of Gefiation. What does not the Foetus then 
'ii. 
undergo? and who can determine the Differences 
between Matrix and Matrix between the Matter 
that is allimilated into a Foetus in one Subje£t r and 
that in another ; between the fixing Principles, the 
Quantity of Salts, Spirits, <&c. in a Parent of one 
Species, and one of another ; between the more co- 
pious or more limited Affluences of affimilating 
Matter; and between Times, where even fingle 
Minutes, Inftants, &c. may be of the greateft Con- 
fequence? 1 fee the Whole indeed, but confufedly; 
yet do I fee the Source of a Variety ; which, 
iDOundlefs as it were, if permitted to expatiate at full 
Liberty, is neverthejefs invariably confin’d, by Him 
who made and rules the Univerfe, to a certain de- 
terminate Number of Species. Time, Aftion, ; Sea- 
fon, Quantity of Force, Quantity of Refinance, fixing 
Principles, Affluence of aflimilated Matter, Direflion, 
6 * and 
