EFFECTS ON THE URINARY TRACT 



375 



The weights of the kidneys in atrophic infants from various sources are 

 shown by the graph in Fig. 96, plotted against body length. The larger dots 

 represent original observations on Minnesota cases. It will be noted that in 

 most cases the weights are below normal, although some cases are definitely 

 above. 



• 83 , " e »83 •*> O90 



• 6> *°° :?S ZIg tft? «80 _ . 67 



Fig. 96. — Graph showing the individual weights of the kidneys, according to body length, 

 in atrophic infants. The larger dots represent original Minnesota cases; the others are from 

 various sources. The curve of normal kidney weight is from data compiled by Prof. R. E. 

 Scammon. Although most of the cases are below noimal weight, there is much individual 

 variation, and many are above normal. 



In Table 2, the percentage changes in the average weights of the kidneys 

 in atrophic infants are estimated in various ways, according to all available 

 data. Thus in comparison with the normal for the corresponding final body 

 weight, the kidneys averaged 20.5 per cent above normal (or 13.7 per cent 

 for the Minnesota cases alone). Compared with the normal for the maximum 

 body weight recorded during life, the kidneys averaged 1.5 per cent above 

 normal. Compared with the normal for body length, the kidneys averaged 

 1.0 (or 7.6) per cent below normal; while according to age they averaged 19.4 

 (or 18.4) per cent subnormal in weight. The individual data for several of 

 the Minnesota cases are given in Table 3. It would thus appear that in mal- 

 nourished infants the kidneys in general are very resistant to loss in weight, 

 ranking not far behind the brain in that respect. 



Among the animals, numerous observations on the kidneys during total 

 inanition (or on water only) will be presented in chronological order, excepting 

 some studies of the changes related to the functional condition, especially 



