1. THE BRITISH JOURNAL OF OPHTHALMOLOGY may be either the commercially impure liquid or the purified product, and (3) denatured alcohol, which was formerly composed of 10 parts of methyl alcohol and 1/2 part of pyridin bases, added to 100 parts of ethyl alcohol, but since December, 1919, this formula has been modified by a reduction of the methyl alcohol from 10 per cent. to 2 per cent. There is a well founded suspicion that in order to evade the Prohibition Act unscrupulous chemists are submitting this denatured alcohol to fractional distillation so as to remove the benzine and wood alcohol and thus secure an impure ethyl alcohol which can be sold for drinking purposes