DAVY

SIR HUMPHRY, %. at I zance, 1778; d. 1829. He waa a g natural philosopher aud chemist, President of the Royal Society from 1 He was the first to discover that s substances as potash, soda, ., ¥ not elements, but compounds of oxy with a metallic base (pota ium, sod i .); his efforts founded the science Agricultural Chemistry, and hie inve ane of the nature of fire-damp led to vention of the safety-lamp. [s. 119]