relating to Air and Water. 3 
and’ had loft 310 griins of their weight. As the air ceafed to 
come a considerable time before all the water had been trans- 
mitted through the tube containing them, I concluded that the 
air was formed from the phlogifton contained in the bones, and 
fo much water as Was neceflary to give it the form of air. 
This air differs confiderably from any other kind of inflam- 
mable air, being in fevcral refpects a medium between that 
from charcoal and that from iron. It contains about one-fourth 
of its bulk of uneombined fixed air, but not quite one-tenth 
intimately combined with the remainder. The water that 
came over was blue, and pretty ftrongly alkaline, which muft 
have been occasioned by the volatile alkali not having been in- 
ti rely expelled from the bones in the former procefs, and its 
having in part diftolved the copper of the tube in which the 
experiment was- made. 
I fubje&ed to the fame procefs a variety of fubftances that 
are faid not to contain phlogifton, but I was never able to pro- 
cure inflammable air by means of them; which Strengthens 
the hypothefis of the principal element in the constitution of 
this air having been derived from thefubftance fuppofed to con- 
tain phlogiston, and therefore that phlogifton is a real fub- 
Stance, capable 01 aSiuming the. rorm of air by means of water 
and heat- 
The experiments above-mentioned relating to iron were made 
with that kind which is malleable ; but 1 had the fame refult 
when I made ufe of Small nails of caji iron , except that thefe 
were firmly fattened together after the experiment, the Surfaces 
of them being cryftallized,. and the cryftals mixing with each- 
other,.. fo that it was with great difficulty that they could be 
got out or the tube after the experiment, and in general the 
'Solid paifs of the nails were broken before they were Separated 
from 
