( ) 
which DuSs are capable to receive the tbinneft parts of the 
Liquor Sminalis^ and convey thoiB to the Mafs of Blood 5 
and thus the Semen is left behind to pafs into the deferens. 
And 'tis worth remarking, that as the Semn grows thick* 
er and thicker by continual reparation, the Canal in which 
it is to run, grows larger and larger, as appears by the 
ftrufture of the Teftkles Epdidymis and Vas Deferents, 
Hence we may give a true account, why the Canals of which 
the Tefticles are compofed, are fo long. viz. That there 
might be time enough to feparate all the thin Fluids* 
By this method we fee, how the thiekeft and thinned 
Fluids may be feparated from the Mafs of Blood, And how 
intermediate Liquors may be feparated after the fame manner 
by Canals of intermediate Dimenfions. 
Thus in a word the whole Doftrine of Secretions may be 
reduced to chis. 
To feparate a Liquor of any determined thicknefs, all the 
Fluids,which are thinner, muft be carry 'doff by fmall Canals, 
and the Liquor to be feparated, being the thinneft of the re- 
maining Mafs is fecerned, becaufe the Dufts are capable to 
receive it and no other, 
CoroUarys. 
1. Hence the ufe of the Spleen is evident. 
2. Hence appears the origin and ufe of the Lymph.iticks. 
3. Hence the Texture and ufe of many minuce parts of 
the Body may be difcovered, which hitherto has been un- 
known. 
You know, Sir, of how great moment fuch confiderati- 
ons as the(e are to the knowledge both of the Caufe and 
Cure of many Diftempers 5 having already in fome degree 
yconvinc'd thofe, who are the only capable Judges of thefe 
matters, that Mechnnkd Enquiries into the Animal OEco- 
PPPPPPP no^ 
