[ i9 ] 
thofe that wrote on the fame Subject afterwards : 
For, where he fpeaks of the Manner of the Circu- 
lation of the Blood thro’ the Mufclc, againft fome 
Opinions before him, “ that it is extravafated from 
“ the Arteries, and abforbed by the Veins,” he fays, 
That the Veins and Arteries meet by the Intermedi- 
ation of Veficles, which he calls, Colleffio Veficula - 
rum fanguifer arum * > that no fuch Extravafation can 
happen, and that this Collection of Vejicles conftb 
tutes the chief Part of the mufcular Flefh; and alfo, 
that their chief Ufe is, like a Strainer, to feparate 
from the Mafs of Blood cenain Particles, neceflfary 
towards the Contraction of the Mufcles. This, if 
maturely confidered, will be found to fquare pretty 
much with Keil and Stuart , as to their Vejicles - 3 as 
will hereafter appear, when we (peak of thefe feveral 
Authors. 
XXV. 
He alfo agrees in other refpc&s with fome of his 
Prcdeccflbrs ; particularly about the Necefiity of an 
Effervefccnce, being raifed in a Mufcle, neceffary to 
its Motion 5 occafioncd by the Admixtion of Particles 
of 
* Which indeed do not exift, but are however firfi: thought of 
by this learned Author; who alfo finds it neceffary to bring to his 
Afliftance the Perme7itation of the moil worthy Founder of thefs 
Ledcures; yet differs from him as to the Nature of Animal Spirits; 
the latter giving them the Name of a Liquor exquifitely impregnated 
with a volatile Salt and Oil ; and the former calling them nitro-aerial 
Particles, which ferment by mixing with the falisio-fulphureous Par- 
ticles of the Blood: Both which Terms feem to be the Invention of 
Dr. Mayow. 
D 2 
