Diagnostic methods, chemical, bacteriological and microscopical, a text-book for students and practitioners . Fig. 114.—Ova and miracidium of schistosomum hematobium, X 300: ^4, Ovum as seenin urine; B, the same after addition of water; C, miracidium. (Tyson after Railliet.) \ calculus takes place by accretion, the deposition of successive layers of materialoccurring around the original nucleus. The material of which the stone con-sists will usually be of one kind, so that we speak of uric acid or phosphatecalculi, for instance, while, occasionally, mixed calculi may be formed by thedeposition
Diagnostic methods, chemical, bacteriological and microscopical, a text-book for students and practitioners . Fig. 114.—Ova and miracidium of schistosomum hematobium, X 300: ^4, Ovum as seenin urine; B, the same after addition of water; C, miracidium. (Tyson after Railliet.) \ calculus takes place by accretion, the deposition of successive layers of materialoccurring around the original nucleus. The material of which the stone con-sists will usually be of one kind, so that we speak of uric acid or phosphatecalculi, for instance, while, occasionally, mixed calculi may be formed by thedeposition of two or more chemical combinations. The classification of urinary concretions is based on the chemical constituentsof J which they are composed. Before examining a calculus chemically a thoroughoptical examination should be made, as this may give a definite clue as to its 1 See Posner, Ztschr. f. Urol., 1913, VII, 799; also, Lichtwitz, Ibid., 810; also, Williams,New York Med. Jour., 1915, CII, 609. 368 DIAGNOSTIC METHODS. composition. After this preliminary examination, the calculus is ground toa fi
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