The proteolytic enzymes of microorganisms have been studied
by a number of investigators; but most of the data obtained are
merely qualitative in nature. A full bibliography on the investigations
concerning bacterial enzymes can be found in the work
of Fuhrman (1907); the investigations of the enzymes of molds
have been reviewed by Wehmer (1907) and by Dox (1910).
Mention will here be made only of those investigations which
have a direct bearing upon the work at hand.