1 40 Hcemajlatics. 
Syphon was laterally fixed into a Hole in the 
middle of the Elder Stick 5 then four Inches 
Depth of Mercury being poured into the Sy- 
phon, its ocher Orifice was clofed up with 
Cement and a Piece of Bladder tied over it. 
When this Inftrument was by means of a brafs 
Pipe fixed to any Veffel of an Animal, I could 
by the Height of the Mercury in the mercu- 
rial Gage fee with what Force Air was im- 
pelled. 
When Air was with this Inftrument forc- 
ed into the defcending Aorta^ or the Vena 
Forta-i none paffed .thence into the Cavity of 
the Guts, tho* Water by Experiment XIV. 
Numb. 12. did freely. 
3. Neither when I (lit a part of the Guts 
lengthways, would any Air pafs thro’ thofe 
rranfverfely- cut, converging Arteries, when 
impelled with a Force equal to chat of the ar- 
terial Blood : But when thofe Arteries had been 
firft wafhed, by the Flowing of warm Water 
thro* them, then the Air alfo would pafs free- 
ly 5 which fhews how requifite it is to wa(h the 
Blood-veffels, before Injedions be made with 
coloured Liquors. 
4. Tho’ Air when blown in at the Aorta 
will not thence enter the -Cavity of the Guts, 
' yet 
1 , 
