Conclusions. ( I ) I t has been conclusively shown that the mercaptans are entirely analogous to the alcohols in esterification. ( 2 ) The limits obtained, using mercaptans, follow, in general, relations observed using alcohols, but are much lower. (3) The reactions between methyl, ethyl and propyl mercaptans and benzoic acid, and between the thiol-esters and water a t 220' may be represented as follows: