1784 July, “History of the Royal Academy of Sciences, for the year 1780”, in A New Review[1], volume 6, page 57:
If you distil the nitrous acid on silk, wool, hairs, or skin, you obtain a certain quantity of animal oil, different from that which forms fat, and a portion of acid similar to the acid of sugar[…]
1828, John Murray, A Manual of Experiments illustrative of Chemical Science[2], page 4:
This is not all: who would suspect under the specious guise of “acid of sugar,” an envenomed drug?
1829, Shirley Palmer, Popular illustrations of medicine[3], page 101:
It exists plentifully in several well-known plants, as the beautiful Wood-sorrel; but, obtainable from saccharine matter by a chemical process, it has acquired the vulgar name of Acid of Sugar.