the Cdva \ that had been made in the firft Experknf nr , We per- 
ceived 3 that this Channel of Communicdtion came from the 
Ductus Thoracicus , at the place of the fourth Vertebra of the 
Back. But to be the furer of it , we made the following Experi- 
ment. 
3; Icompreffed with my fingers the D^rf^j upon the fifth 
fcending Fcrtehra of the Back and M. Gajant having Wown into 
theQnill, wliich was upon xht [eventh ^ the wind paffcdnot to 
the Kidney , nor to the BmulgentVein. Which made us conclude, 
that the Communication was not beneath the ffth Vertebra. 
Then I comprefled with my fingers the Ductus 7horacicus and the 
VenaCava upon the /fe>^ defcending Tifr^^^r^ • zxi^ x}i\tEniulgent 
fwelled,when yi. Gay ant blowed into the Quill : Which gave 
us more ftrongly to believe , That the place of the Ductus ihora- 
aV^i^ whence goes the Channel of Cornmerce with the Emul- 
gent;> was between the third and fifth r^rf^^r^ of the Back,, as the 
wind had informed us in the fecond^ Experiment. 
To be yet luore afTured thereof ^ M. Gayant fplit the Ductus 
Thoracicus upon the third Vertebra of the Back , and having 
blown into it at the Quill, the wind came out at the Axillary 
Vein y and tb^jfce/sding Ca'va 3 but the £^5^/^/^^^/ fwelied not 
at all. 
We made a fourth Experiment , which feemed very curious to ^ 
us ^ and will not be mifs to relate here , *viz,- 
M: Gayant having blown into the ^^rf/, whereof all the 
branches, that had beencut , were tied up, it fwelled immediately^ 
and theEmulgenc Artery grew tumid at the fame time: but the 
wind , that was protruded thorow the Emulgent Artery into the 
Left Kidney , returned not inro the Emulgeat 5 which taught 
us y that the Blood often paflfeth , ivhere the Air does not. 
We have ah evident proof of it in the Kidriey , fince that the 
Bloodoi thQ Fjmulgent'i^rtery^ which goes to th^ Kidney^ returns 
thorow the E>^/if^^>?/)^^/>^ into the Vena Cava , purfuant to the ^ 
Rules of the Circulation of the Blood and that the Air propelled 
thorow the Emulgent Ariery into the Kidney , comes not back tho*-^ 
row the Emulgent Vein into the Nena Cava, 
