Analyfts of the Air. zi$ 
N. B. I poured hot water into the cittern 
xx, (Fig. J4.) to promote the ferment. 
A like quantity of filings of Iron , and 
powdered Newcafile Coal, did in 3 or 4 
days generate 7 cubick inches qf air. I 
could not perceive any fenfible warmth in 
this mixture, as was in the mixture of Iron 
and Brimfione. 
‘Powdered Brimfione and Newcafile Coal 
neither generated nor abforbed. 
Filings of Iron and Water abforbed 3 or 
4 cubick inches of air, but they do not ab- 
forb fo much when immerfed deep in wa- 
ter ; what they abforb is ufually the firft 1 
or 4 days. 
Filings of Iron, and the abovementioned 
Walton Pyrites, in Exper. 70. abforbed in 
4 days a quantity of air nearly equal to 
double their bulk. 
Copper Oar, and compound Aqua-fortis'l 
neither generated nor abforbed air, but mix- 
ed with water it abforbed air. 
A quarter of a cubick inch of Tin, and 
double that quantity of compound Aqua- 
fortis, generated two cubick inches of air 5 
part of the Tin was diflolved into a very 
white fubftance. 
E XPE- 
