Hire requires. And this Doftrine of the Ufe of the Smui ner- 
vo[m in the work of Sffrif^/f?;^ appearing Paradoxical,and,as he 
thinks, not having hitherto been taught by any, though fome 
have long fince afcribed to it a Fermenmive power,and affign- 
ed to ic a confiderable life in the bufinefs of Nutrition , he la- 
bors here by feveral reafons to evince the truth of this his new 
aOTertion. Which done, he pafles on to deliver his whole By- 
pothefis^io fliew, In what manner the Secretions in our Body are 
performed by means of this Nervous Juyce. 
Here then he fuppofeth /r/?,That,as there is aready paffige 
of the blood out of the arteries into the veins upon the account 
of a fit pofition of thefe in reference to that motion, fo there is 
an eafie and direft way out of the orifices of the Nerves, infer- 
red in the Glandu is, to -thofe of the Secretory veflels : Second- 
ly^ that thefe veflels for Secretion are pofited tranfverfly in re- 
fped: to the Sanguiferous, in fuch a manner that a line, drawn 
from one of them to the other,decuflates, fthough perhaps not 
at righr angles) the place where the Capillary Arteries dif- 
charge themfelves into the Capillary Veins. 
This done,he conjeftures, that whilft the Blood is permeating 
the Glanduls wherein the Secretion is to be made , the Ner- 
vous Juyce runs continually out of the adjacent Nerves into 
the current of the Blood,and that,upon irritation,more ftrong- 
ly and more copioufly ; and the fame Juyce prefently, nimbly, 
and with a ^uSicknt impetus trajefts the faid current objedled 
to it, it being both aftive in it felf,and receiving alfo a more vi- - 
gorous motion from the heat and agitation of the blood. And 
whilft this is doing,the minute particles of the Nervous liquor 
muft needs in their way hit againft thofe grofler whereof the 
greateft part of the Blood confifts, which, whilft they with- 
ftand the direfl motion of the Succui nervofus^ are by the agili- 
ty of its parts propeird,in asdiredica line as may be, to the op- 
pofit fide of the vcfl^el wherein they run , forafmuch as thofe . 
grofler ones, being already in motion,do eafily receive a deter- 
minationfrom other particles that are moved more ftrongly 
andfallfidewayes upon them. Now the parts of the Blood 
being thus protruc[ed,they do, when they meet with the ori- 
fices above-mention'djwhich go into the Secretory veflels, pafi 
into 
