Note 69 — PART FIRST. (continued 3)
Reading edition
Hydrogen air is the same with that by Dr. Priestley called inflammable air. He also discovered the true composition of it. Having included a few grains of charcoal in the receiver of an air-pump, and exhausted the air, he heated it in vacuo by means of a large burning glass. The charcoal was entirely volatilized and converted into this kind of air. He found, however, that without some small portion of moisture this volatilization did not take place.