APPENDIX. 323 
Experiment VI. 
I. IjTN Experiment CXVI. Vol. L p.' 2,^4, 
X I have given an account of the refult of 
fcveral Experiments made by the Refpiratioii 
of Air, included in Bladders. In order to 
obviate the Inconvenience that I apprehend- 
ed might arife from the rancid Vapours of 
Bladders, I made ufe of the following Me- 
thod, to try with greater Eafe and Accu- 
racy, how long I could breathe to and fro, a 
certain Quantity of Air, and to find how 
much of its Elafticity was in that time de* 
ftroyed, viz. 
2. I cemented fail at a Hole in the Top 
of an Air Pump-Receiver, a wooden Fofler. 
I fet this Receiver, whofe Diameter was nine 
Inches, in a wide VefiTel which had two 
Inches depth of Water in it, leaving room 
at the Bottom for the Water to pafs freely 
to and fro. In this Pofition the Qiiantity of 
Air in the Receiver was equal to five hundred 
and twenty two cubic Inches. Then ftop- 
ping my Noftrils, I firfl: breathed out what 
Air I could from my Lungs, and then ap- 
plied my Mouth to the end of the FonTet, 
Y 2 where 
