Glycogenic and fatty conservation is a function possessed by both zoological classes as are the detoxicating and bile-producing powers. However it is highly probable that urea and creatin in metabolism is not cared for by the avian liver as it is by the mammalian, judging by the researches of Paton and of Richet. FAT DEPOSITS. The care of fat by the liver is very well shown by examining the incidence of fatty metamorphoses through the various orders. In the first place Mammalia show a slightly higher percentage of fatty change than do Aves and should show a greater difference were it not for the large number of cases in two orders of the latter. Among mammals, lemurs, rodents and marsupials store fat in the liver more than other orders but in the second and third, it is chiefly the carnivorous varieties that have this property. Just why the slothful herbivorous lemurs should be first on the list is not evident especially since the grain-eating Ungulata are least apt to present fatty livers. With this exception, mammals with plentifully available hydrocarbons in their diet are most apt to show its deposit in the organ under discussion. Among the birds the gallinaceous varieties stand far ahead of all others, the passerines following next. Galli show the condition in association with acute infections, chronic diseases and in health. Unless there be distinct reason for it at autopsy, it may almost always be said to be normal. Passeres, especially the smaller forms, frequently come to autopsy with such excessively large livers, and indeed with a very large pad of abdominal fat, and nothing else, that one is compelled to look upon this overburdened organ as incapacitated by the deposit. These two orders increase the percentage value for the birds. Striges, Anseres, and Accipitres also show a good number of cases but there is among the Aves no such clear relationship between food fat and fat infiltration as may be found in the Mammalia. AMYLOID DEPOSITS.