URINE 



473 



In addition to the methods cited above a number of studies of 

 kidney efficiency, based on the elimination of administered urea, have 

 been made by various investigators, among whom may be mentioned 

 McCaskey, 1 Addis and Watenabe, 2 MacLean and De Wesselow* and 

 Weiss. 4 



1 McCaskey: Med. Rec., 85, 507, 1914. 



2 Addis and Watenabe: Jour. Biol. Chem., 28, 251, 1916. 



3 MacLean and DeWesselow: Brit. Jour. Exp. Path., i, i, 1920. 



4 Weiss: Jour. Am. Med. Ass'n., 76, 298, 1921. 



