Derivatographic thermal analysis of renal tract calculi.

I) UVAL’S EXAMINATION by thermal gravimetry of nearly 1000 chemical precipitates (1) had suggested to one of us the employment of thermal methods in the analysis of concretions of biologic origin. Indeed, use of the thermogravimetric technic was made in conjunction with infrared spectrophotometry (2) and X-ray crystallography (3) in investigations concerning tile formation mechanism of renal tract and gallbladder calculi. The present work was designed to test tile idea of applying thermal derivatography, a conibined gravimetric and differential thermoanalytic method (4, 5), to renal tract calculus analysis.