"Cavendish's experiments consisted in exploding, in various proportions, mixtures of and atmospheric air, and of hydrogen and oxygen, and finding as the result a liquid which proved to be pure water. (Priestley and his friend, Mr. [John] Warltire, had made similar experiments, and had noticed the deposition of moisture that followed the explosion, but failed to recognize it anything but the condensation of aqueous vapors in the gases.)"