_Body Weight_ _Total Urinary Solids_ 90 pounds 500 grains 95 〃 535 〃 100 〃 570 〃 105 〃 605 〃 110 〃 640 〃 115 〃 675 〃 120 〃 710 〃 125 〃 745 〃 130 〃 780 〃 135 〃 815 〃 140 〃 850 〃 145 〃 885 〃 150 〃 920 〃 155 〃 955 〃 160 〃 990 〃 165 〃 1025 〃 170 〃 1060 〃 175 〃 1095 〃 180 〃 1130 〃 185 〃 1165 〃 190 〃 1200 〃 195 〃 1235 〃 200 〃 1270 〃 205 〃 1305 〃 These figures do not represent much active exercise, and with increased bodily exertion the solids passed should be more. Men excrete about one-tenth more than women; there are also less urinary solids passed with advancing age, and about five per cent may be deducted for each ten years after forty. The estimation of the total solids is easy with Haines’ modification of Hasser’s method. _Multiply the last two figures of the specific gravity of the urine by the number of ounces voided in 24 hours, and add ten per cent to the product._ Thus, if the amount passed in 24 hours was 36 ounces with a specific gravity of 1.021, it would be 36 × 21 = 756 + 10 per cent = 832 grains of solids in the whole amount of urine excreted that day. By comparing this with the table it can be readily ascertained if the amount is above or below the normal standard for the body weight of the patient. For many years I have employed this method of determining the urinary output in hundreds of patients with various diseases of the skin and cancer, and have found it of inestimable value. It is understood, of course, that by dietary and medicinal measures the urinary solids are to be brought up to and maintained at normal.