I had the pleasure of seeing this case as recently as February 2d of this year. While the function of his remaining kidney is evidently quite poor, as shown by an output of only 16% of phenolsulphonephthalein (injected intravenously) in the first half hour and 10% during the second half hour, he says he feels fine and has suffered only moderate inconvenience due to frequency. His weight is now 178 and has remained so for quite a time. While his urine still contains pus, a careful search failed to reveal the presence of T. B. bacilli. Could Dr. McBurney have availed himself of the use of the X-ray and our present renal functional tests, he doubtless would not have been satisfied with a mere exploratory operation. And, finally, eighteen years later, when the X-ray, together with the patient’s symptoms and urinary findings, did point out the true diagnosis, and the kidney which was involved, or most involved, it remained for the polyuria test to decide the question of operating at all. For, while the right kidney was tubercular without a doubt, who could offer any prognosis as to the outcome in the event of a nephrectomy, without some knowledge of the condition of the other kidney? That the X-ray showed nothing definite on that side, told us nothing of the kidney’s functional power. Since cystoscopy, or the passage of any instrument of any size into the bladder could no longer be endured, reliance had to be placed on the experimental polyuria test. This showed fairly good renal function _somewhere_, and inasmuch as the X-ray had shown what was probably a considerable involvement of the right kidney, it was inferred that the “fairly good renal function” belonged chiefly to the left kidney. The case, also well emphasizes, the fact that renal tuberculosis may exist for a long time and then respond to proper treatment. _Case III, G. S._—In October, 1904, this patient then nineteen years of age, consulted a physician in Albany N. Y., because of moderate frequency of micturition by day and night, attended by much terminal pain and blood on a few occasions. T. B. bacilli were found in his urine at that time, which gave a positive guinea-pig test. Cystoscopy was performed and as a result the patient had chills, a rise in temperature to 104, and some pain over his left kidney. A diagnosis of tuberculosis of the prostate was made and the patient put on treatment which resulted in an amelioration of his symptoms for some time.