MEDICAL PROGRESS.

Concerning Glycogen in the Muscles.—E. Külz found that the quantity of glycogen contained in the muscles of the frog is increased under the influence of daily subcutaneous injections of grape sugar, even after extirpation of the liver. It seems, therefore, that the muscles are capable of making glycogen without any assistance on the part of the liver. This conclusion has recently been attacked by Laves. He extirpates the liver of geese and chickens after giving them a meal of barley and oats; ascertaining the amount of glycogen in a fragment of the pectoral muscle immediately before the operation, he repeats the determination some hours (one to thirteen hours) after the extirpation of the liver, and continually finds less glycogen at the second test. He concludes therefrom that the pectoral muscle is incapable of producing glycogen, in the absence of the liver, at the expense of the feculents in