To the Editor:
—I read with great interest the excellent paper of Lieutenant Harry C. Wall entitled "A Renal Concentration Test Using Solution of Pituitary" in the April 1943 issue of the Archives of Internal Medicine.I am sure that you and the author will be interested in the fact that in 1921 I published a paper, "Pituitrin zur Nierenfunktionsprüfung" (Med. Klin.17:871 [July 17] 1921). As the title implies, I suggested the use of solution of pituitary instead of a period of thirst in order to determine the ability of the kidneys to produce a concentrated urine. I reported 3 cases of impaired renal function in which tests done by means of solution of pituitary gave the same results as tests of concentration done by means of a period of thirst. I am sorry that I have no reprint to send you.