324 APPENDIX. 
where I breathed to and fro, the five hun- 
dred and twenty two cubic Inches of Air, 
for two Minutes and half ; when growing 
uneafy, I breathed out all the Air I could 
from my Lungs, as at the firft, at the fame 
time giving a Signal to a Stander by, to mark 
the Height of the Water in the Receiver 
with a piece of Chalk ; and upon mcafuring 
1 found that eighteen cubic Inches, or /9th 
Part of the whole Air, was in that time re- 
duced from an elaftic to a fixed State ; but 
fome further Allowance is to be made on ac- 
count of the Expanfion of the Air, by rea- 
fon of the Heat it had received in Refpi- 
ration. 
3. We fee in this Experiment that near 
two Gallons of Air, which received no noxi- 
ous Fumes from the Receiver, 'yet being 
breathed to and fro for two Minutes and 
half, became thereby unfit for Refpiration: 
Whence no wonder that the Air fliould be 
infeded, and apt to breed Diftempers in clofe 
Prifons, where not only the Breath, but alfo 
the plentiful Perfpiration of many confined 
together flench the Air, and make it apt to 
breed what are called Goal Diftempers 5 
which Inconvenience might in a good Mea- 
% fure 
