Crookes, Sir William. Scientist, inventor. Born in 1832. Past-president of the Chemical Society; past president of the Institution of Electrical Engineers; president of the British Association, 1898; vice-president of Royal Society, 1895-96; president of Society for Psychical Research, 1897. Discoverer of thallium and of properties of radiant matter; inventor of the radiometer, spinthariscope, and other instruments. Wrote "Manufacture of Beet Sugar," "Handbook of Dyeing," "Manual of Practical Assaying," "Select Methods in Chemical Analysis," "The Wheat Problem," etc. Editor of the "Chemical News." Died 1919.

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