~Adjusting the Proteins in Diet.~--If the individual shows a definite anemia, as is often the case after acute attacks, either as a result of the disease itself or the necessarily low diet, which the acute symptoms of uremia and edema made necessary, other measures are necessary to bring the body back to a normal condition. It has been found that in these cases where there has been no permanent damage to the renal organs, but merely a temporary impairment of the functioning power, the treatment must be, first, a rest to the affected parts; second, the temporary restriction of all articles of food which impose a tax on the kidneys to eliminate; the third, the gradual return to normal diet as the acute symptoms decrease and the function of the kidneys no longer shows impairment. Such a case is cited by Strouse and Perry[127] as occurring in the Michael Reese Hospital. Mr. X. recovered from the acute stage of nephritis and all signs of edema and uremia disappeared; the man was kept on a low salt and low protein diet for a long time. His urine was clearing up, but he did not feel up to standard and remained anemic. Thinking in all probability that his symptoms were due to a low protein diet, meat was slowly added to his dietary until he was receiving 60 grams of protein a day. There was an immediate general improvement in his condition with no increased renal disturbance. It is an obvious fact that chronic nephritis, like any other chronic condition, requires a different method of treatment from that practised to relieve the acute stage. The very fact that it is chronic proves that the strenuous methods are neither necessary nor wise. ~Testing the Kidney Functions.~--The authorities of to-day endeavor to ascertain the extent of the damage to the renal organ by testing its functioning power. These renal function tests have been the subject of much interest and investigation. Probably the ones most commonly employed are those devised by Hedinger and Schlayer[128] and adapted for use in the Johns Hopkins Hospital by Mosenthal. ~Diets Used in Tests.~--The diet employed in making these tests consists of different amounts of certain substances known to be diuretic in character. This diet is rigidly adhered to and a careful analysis of the urine passed, the total quantity and specific gravity of each specimen made and in this way the various functions of the kidneys and the impairment thereof are tested. Thus an intelligent adjustment of the diet may be made. ~Renal Functional Tests.~--The following schedule is used by Mosenthal, of the Johns Hopkins Hospital, in making what is known as the "Two-Hour Test for Renal Function": HEDINGER-SCHLAYER-MOSENTHAL DIET[129] For _________________ Date _________________ All foods to be salt-free from the diet kitchen, salt for each meal will be furnished in weighed amounts.[130]