Thirty years ago young students of chemistry rode their bicycles to lectures on the new chemistry of organic synthesis, learning how to make dyestuffs, medicines, perfumes out of coal tar products. Twenty years ago young students of chemistry were specializing in electrochemistry, the breaking up of compounds by means of an electrical current. Ten years ago colloids —the suspension of particles of matter in other matter (wood, paper, clothing, glass, cement, enamels, candles, celluloid, cheese, paints)—began to be regarded as a field-in-itself for young students...
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