out of the Inteftins into the Milky veffelsy and that of the 
Nervous Juyce ouc of the Arteries of the Brain into the 
Nerves. As to the Mixt Secretions, he will have them 
perforin'd by a Ferment, as that by means thereof there be im- 
prefs'd fuch a determination on Tome certain particles of 
the Biood , that leaving behind others they readily pafs 
into the veflTels fratr/d for Secretion.And here he confiders^thac 
if this kind of Separation were tranfafted h^meer Percolation^ 
nothing probably could hinder^ but the more fubtile u^atter 
would come away, and rhe grofTer flay behind : Wherefore to 
procure a recefs of the groffer parts, he calls in the help of 
feme fuch Fennentj,as may precipitate thefe into the Secretory 
veffels. On which oceafion he difcourfes largely of Ferments^ 
affigning them not only the life of digefting and elaborating the 
Jtjyce.s of the body, but alfo that of [ecreting them. Where in- 
deed he takes pains to penetrate into the nature and properties 
oi Ferment s^mmit\y examining,What Bodies are qualified for 
Fermentation jWhat difference there isin Ferments;and whence 
the Fermentative power arifeth ; as alfo the Smalnefs of a Fer- 
ments proportion to the Body to be fermented, and the neceffi- 
ty of fome warmth to excite Fermentation t Explaining with- 
al the Size and Figures of the parts of Fermenting bodies ^ 
which he teaches to be very fmall, very angu!ar,^and exceeding 
diffimilar,afllgninghis reafon for fo doing. To which he adds 
the two main Differences he finds in Ferments, fome having an 
ExpAnfive^ and others a PreciptAting power ; and having len- 
dred the caufe from whence proceeds this differencejie aiTerrs,, 
that Nature makes ufeof the/Jm^rin fimple> andof Va^ latter 
in mixc Secretions. 
After this,he proceeds to fliew,What it is that Ferments do 
confer to Secretion, and whence they arederived? As to the for-- 
mer^ he affirms, that there are ^ome Ferments, that are preceda- 
neous to Secretion, and able to loofen and fubtilize ihemafs 
to be fermented, for the more eafie disjunftion of the parts^ 
butthat thei e is an i?/^^r, which immediately caufeth the very 
afl: of Secret lon^ which he takes to be the Nervous with- 
out the direflion of which he efleems there will hardly be made 
any aftual difTociatioa of fo many different Subftances, as Na- 
ture 
