Odours Caused by Attrition

Abstract

THE unpleasant odour which attends the attrition of pebbles, etc., appears to have been noticed at a much earlier date than any mentioned by previous correspondents. Robert Boyle (“The Efficacy of Languid Motion,” Works, edited by Boultori, 1699, vol. i., p. 234) remarks: “And that it may further appear, that a peculiar Modification of Motion, may contribute to the various Effects produced by it, I shall observe, That those Stones which Italian Glass-men make use of [quartz?], afford Sparks of Fire by Collision; but if moderately rubb'd together, they emit fœtid Exhalations; from whence probably proceed those offensive Steams, emitted by Glass; and what is more remarkable, and to our purpose is, tho' Glass when Red-hot emits no such Effluvia; yet if two pieces be dextrously rubb'd together, they will send forth Steams copious enough and fœtid.”