COMPOSITION OF URINE AND FECES AFTER THE FIRST YEAR OF LIFE THE quantity of urine voided by children after infancy is, because of numerous observations, known with some exactness. The quantity does not increase with age and weight like the food, as Camerer sup poses, but more slowly; particularly in boys. But the concentration and amount of urea increase very markedly. This occurs in consequence of the very strong perspiration, which is observed in older boys who exercise much; and in them it exceeds considerably that of younger children and of adults. The following tables (Camerer) contain the aver age values for the different periods of age; naturally, they vary within fairly wide limits, as may be seen from a number of my own observa tions recorded below: The cases used for the table are either convalescents from acute febrile infectious diseases, or those present in tlit‘ hospital on account of surgical diseases: .111 Were afchrilc ttnd expected soon to be dis charged. No urine 1):1 I hOlOgiCttl. diet corresponds WW1 the forms previously given.
The following contains some data concerning the composition of the urine of older, healthy children, with regard to the division of the nitrogen in the individual constituents.
I. Average 2-1 hours, excretion of two 3 year old boys, according to Camerer, Jr. DO: Table diet, milk, meal, vegetables, potatoes, egg, bread, much water.
II. Average values of 4 girls :i years of age. DO: 1 litre milk and table diet (Camerer, Jr.).
III. Average values of the 24 hours excretion of a girl 7 years of Duration of observation, 10 days. Diet: Milk (1000), zwieback (I50), egg (1401, meat (100), cereals with milk (100).
IV. Xverage values of a boy 7 years of age. Duration of observation, s days. Diet: Milk (1000), rolls (1501, butter (25). vegetables (100i, bouillon (250), meal (125).
V. Average values of a 7 year old girl. Duration of observation, s, to 9 clays. Diet: Like III.
VI. Average values of an 11 year old girl. Duration of observation, 12 days. Diet: Rolls (2504 butter (35), vegetables (200), meat (125), milk (1000), cocoa (30), bouillon (2504 A few remarks may be added. The secretion of uric acid varies very much in the older child, as the investigations of Gappert show. A normal value cannot he stated. If the kind and amount of food are equal, the proportion of uric acid to the total nitrogen of the urine re mains constant. This proportion depends on the quality of the food, but not on the amount of nitrogen introduced. The preparation of sul furic ether acids to the total sulfuric acid is very constant, but its abso lute amount is subject to wide variations. The mineral constituents of the child's urine do not differ materially from those of the adult: unlike the urine of the infant, the sodium chloride forms the main part of the salts in the older child.