Together with Dr. Max Kahn,1 I have reported the analyses of twenty-five urinary calculi. The results showed, contrary to the usual statement, that the large majority of renal stones are composed of calcium
oxalate and not of uric acid or urates. I now report the results obtained in the chemical analysis of a new series of twenty-six renal calculi of which, as may be noted from the tabulated data, only two were uric acid stones, while the balance, or twenty-four, were composed principally of calcium salts.
I was unable to demonstrate any trace of lecithin or cholesterol in the ether-alcohol extract of any of these calculi.
We have pointed out previously the necessity of changing our therapeutic ends with regard to the treatment of renal calculi.2 We again draw attention to the fact that the therapeutic measures for the treatment of insoluble calcium salt calculi are completely different