[ 2°7 I 
patient drink plentifully of liquors ftrongly impreg- 
nated with it. The event was fuch, that I requefted. 
Mr. Hey to draw up a particular account of the cafe, 
defcribing the whole of the treatment, that the pub- 
lic might be fatisfied that this new application of 
fixed air is perfectly fafe, and alfo have an oppor- 
tunity of judging how far it had the effect which I 
expected from it; and as the application is new,, 
and not unpromifing, I fhall beg leave to fubjoin his > 
letter to me on the lubjed, by way of Appendix to 
thefe papers. 
V. 
Of, Air in which a mixture of brimstone 
AND FILINGS OF IRON HAS STOOD, 
Finding in Dr. Hales’s account of his experiments, 
that there was a great diminution of the quantity of 
air in which a mixture of powdered briinftone and 
filings of iron, made into apafte with water, had flood, 
I repeated the experiment, and found the diminution 
greater than 1 had expeded. The diminution of 
air by this procefs is made as effedually, and as ex- 
peditioufly, in quickfilver as in water; and it may 
be meafured with the greatefi accuracy, becaufe there 
is neither any previous expanfion nor increafe of the 
quantity of air, and becaufe it is fome time before 
it begins to have any fenfible effed. The dimi- 
nution of air by this procefs is various; but I have 
generally 
