a. (UN-1 7, 5 b.)
1802–12. Bentham, Ration. Judic. Evid. (1827), IV. 16. On a variety of undetectible, though false, pretences.
1877. Le Conte, Elem. Geol. (1879), 239. In the strata the quantity is so small as to be undetectible.
