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The literature of carbohydrate hydrolysis dates from 1912 when Kirchoff (1) hydrolized starch to sugar with strong acids. Dubunfraut (2) in 1830 got the same result with an extract of malt. The active principle of malt was precipitated Payen and Persoz (3) in 1833, and again three years later by linter. This opened for investigation the new field of specific organic catalysts. The term enzyme was first applied by Kuhne in connection with yeast fermentation and soon came to be used in reference to all organic catalysts. The specificity of enzymes was soon recognized and proteolytic or protein splitting, lipolytic or fat splitting, amyolytic or carbohydrate splitting, oxidazing or reducing, etc., anzymes were found. In fact, enzymes it was discovered were responsible for a great many of the complex changes, both analytical and synthetical, upon which the catabolic processes of life depend. Wittich (4) in 1873 demonstrated for the first time a substance in the liver which hydrolizes glycogen. His work followed Bernard's (5) discovery of glycogen in 1857, who a little later independently produced similar evidence of glycogenase. Pavy (6) in 1879 corroborated these results of Wittich in 1873, and of Bernard in 1877, extracting the enzyme from the liver and demonstrated its independent function.

Variation in the carbohydrate and diastase contents of the tissues after feeding