An American text-book of genito-urinary diseases, syphilis and diseases of the skin . n the first and second in con-sistency ; the former in color vary from gray to white; the latter are yellow-ish or reddish. 414 VESICAL CALCULUS. The Form.—When solitary and freely movable in the bladder the formof stones is characteristic, varying from round to oval; it is determined also by its chemical composition: a pure uratestone has usually a long oval, the pure oxa-late a more spherical shape, while a mixedstone of urates and oxalates will incline tothe form characteristic of the predominat-ing crysta
An American text-book of genito-urinary diseases, syphilis and diseases of the skin . n the first and second in con-sistency ; the former in color vary from gray to white; the latter are yellow-ish or reddish. 414 VESICAL CALCULUS. The Form.—When solitary and freely movable in the bladder the formof stones is characteristic, varying from round to oval; it is determined also by its chemical composition: a pure uratestone has usually a long oval, the pure oxa-late a more spherical shape, while a mixedstone of urates and oxalates will incline tothe form characteristic of the predominat-ing crystals. The form of stone is modi-fied also by certain local conditions : mul-tiple stones, for example, are facetted;stones lying in diverticula take very curi-ous shapes. A long, oval stone with an oxalate sur-face will always be foimd to have a largenucleus of nric acid or urates, while onewhich is spherical will have no such nu-cleus or a very small one. Stones com-posed wholly of triple phosphates oramorphous phosphates have the form ofa long oval, like that of the pure urates,. Fig. 120.—Spikelet of meadow foxtail coveredwith phosphatic deposit (Harrison). Fig. 121.—Needle more than half covered with adeposit of lithic acid (Harrison). but they are rare ; ordinarily, stones with an outer layer of phosphates havelarge nuclei of urates or oxalates and have no specially characteristic form. Spontaneous Fracture of Stone.—The subject of spontaneous fractureof stone has been treated by few writers (Ord, Debout dEstrees, Fenwick, etc.).
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Keywords: ., bookcentury1800, bookdecade1890, booksubject, booksubjectsyphilis
