Reference > Brewer’s Dictionary > Touchstones.

 Tou’chet.Touchy. 
CONTENTS · BIBLIOGRAPHIC RECORD
E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
 
Touchstones.
 
A dark, flinty schist, called by the ancients Lapis Lydius; called touchstone because gold is tried by it, thus: A series of needles are formed (1) of pure gold; (2) of 23 gold and 1 copper; (3) of 22 gold and 2 copper, and so on. The assayer selects one of these and rubs it on the touchstone, when it leaves a reddish mark in proportion to the quantity of copper alloy. Dr. Ure says: “In such small work as cannot be assayed … the assayers . . . ascertain its quality by ‘touch.’ They then compare the colour left behind, and form their judgment accordingly.”   1
   The fable is, that Battus saw Mercury steal Apollo’s oxen, and Mercury gave him a cow to secure his silence on the theft. Mercury, distrustful of the man, changed himself into a peasant, and offered Battus a cow and an ox if he would tell him the secret. Battus, caught in the trap, told the secret, and Mercury changed him into a touchstone. (Ovid: Metamorphoses, ii.)   2
        “Gold is tried by the touchstone, and men by gold.”—Bacon.
   Touchstone. A clown whose mouth is filled with quips and cranks and witty repartees. (Shakespeare: As You Like It.) The original one was Tarlton.   3
 


 Tou’chet.Touchy. 

 
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