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 animals. He alludes to other kinds of vapour, but does not precisely define them. The carbon dioxide he named "gas sylvestre."

This was the first use of the term gas. "Hunc spiritum, hactenus ignotum, novo nomine gas voco." (I call this spirit, heretofore unknown, by the new name gas.) What suggested this name to him is not certain. Some have supposed that it was a modification of the Flemish, geest, spirit; by others it is traced to the verb gaschen, to boil, or ferment; and by many its derivation from chaos is assumed.

His physiology was a modification of that of Paracelsus. An Archeus within ruled the organism with the assistance of sub-archei for different parts of the body. Ferments stirred these archei into activity. In this way the processes of digestion were accounted for. The vital spirit, a kind of gas, causes the pulsation of the arteries. The Soul of Man he assigned to the stomach. The exact locality of this important adjunct was a subject of keen discussion among the philosophers of that age. Van Helmont's conclusive argument for the stomach as its habitation was the undoubted fact that trouble or bad news had the effect of destroying the appetite.

John Rudolph Glauber, who was born at Carlstadt, in Germany, in 1603, contributed largely to pharmaceutical knowledge, and deserves to be remembered by his many investigations, and perhaps even more for the clear common sense which he brought to bear on his chemical work. For though he retained a confident belief in the dreams of alchemy, he does not appear to have let that belief interfere with his practical labour; and some of