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URINARY CALCULI. 835
amount of organic matter, but consider the calculus in the former case
as completely burnt and in the latter as unaffected.
When the powder is in great part burnt up, but a significant quantity
of unburnt residue remains, then the powder in question contains as a
rule urates mixed with inorganic bodies. In such cases remove the urate
with boiling water and then test the filtrate for uric acid and the sus-
pected bases. The residue is then tested according to the following
scheme of HELLER, which is well adapted to the investigation of urinary
calculi. In regard to the more detailed examination the reader is
referred to special works on the subject.
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