. ( 4 * 3 ). 
tbeCavd 5 that had been made in the firft Experiment. We per- 
ceived , that this Channel of Communication came from the 
Ductus Thor acicus , at the place o.f the fourth Vertebra of the 
Back. But to be the furer of it , we made the following Experi- 
ment.. 
3; I compreCeH with my fingers the Ductus upon the fifth de- 
scending Vertebra of the Back • and M. Gay ant having blown into 
the Quill , which was upon the feventh , the wind palled not to 
the Kidney , nor to the Emulgent Vein. Which made us conclude,' 
that the Communication was not beneath the fifth Vertebra , 
Then I compelled with my fingers the Ductus. Tim actons and the 
Vena Cava upon the third defcending Vertebra 5 and the Emulgent 
Swelled, when M. Gay ant blowed into the Quill : Which gave 
us more ftrongly to believe , That the place of the Ductus Zhora* 
cicus c whence goes the Channel of Commqxe with the Emul- 
gent ? was between the third and fifth Vertebra of the Back, as the 
wind had informed us in the fecond Experiment. 
To be yet more affiir ed thereof, U.GayantfyWt the -Ductus* 
Thor acicus upon the third Vertebra of the Back , and having 
blown into it at the Quill- ' the ^VfckEcame out' at the Axillary 
Vein, and the Afc ending Cava 3 but the Emulgent Swelled not 
at all. 
We made * fourth Experiment, which feemed very curious to 
us , and will not be raifs to relate here , viz, 
4 . M.. Gay ant having blown into the Aorta, whereof all the 
branches, that had been cut, were oed up, it fwelled immediately,, 
and the Emulgent Artery grew tumid at the fame time: but the 
wind , that was protruded thorow the Emulgent Artery into the 
Left Kidney , returned not into the Emulgeat Vein 5 which tau CT ht 
us,, that tht Blood often pafleth, where the Air does not. 
We have an evident proof of it in the Kidney , fince that the 
Blood of the Emulgent Artery, which goes to the Kidney, returns 
thorow the Emulgent Vein into the Vena Cava , purfuant to the 
Rules oi the Circulation of the Blood 5 and that the Air propelled 
thorow the Emulgent Artery into the Kidney, comes not back tho** 
raw the Emulgent Vein into the Vena Cava.: 
Wee 
L; . ’• .. ^ . ' ' 
