. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. 4280.—1. Cystin. 3. Gonorrhoea! Thread. 3. Spermatozoa. tin is usually accompanied by oxalate of lime ; in alka-line urine by an abundance of triple phosphates and cal- 437 REFERENCE HANDBOOK OF THE MEDICAL SCIENCES. cium phosphate ; when decomposing, this urine alwaysevolves sulphuretted hydrogen gas. Cystinuria is usu-ally an hereditary disorder. (See Cystin.) Tyrosiu precipitates are sometimes accompanied bythe spheres of leucin (Fig. 4276), but,
. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. 4280.—1. Cystin. 3. Gonorrhoea! Thread. 3. Spermatozoa. tin is usually accompanied by oxalate of lime ; in alka-line urine by an abundance of triple phosphates and cal- 437 REFERENCE HANDBOOK OF THE MEDICAL SCIENCES. cium phosphate ; when decomposing, this urine alwaysevolves sulphuretted hydrogen gas. Cystinuria is usu-ally an hereditary disorder. (See Cystin.) Tyrosiu precipitates are sometimes accompanied bythe spheres of leucin (Fig. 4276), but, usually, the latterare not deposited unless the urine is concentrated. (SeeLeucin and T3rosin.) Fat is a very rare precipitate, except in chyluria. If. Fig. 42S1. -Octahedra-envelope Crystals, Disks, and Dumb-bells of Oxa-late of Lime. (Beale.) the turbidity of a sample of urine be due to fat, it iscleared up when shaken with ether. (See Fat in urine.) Among the inorganic deposits, calcium oxalate is theonly one that occurs in acid urine, but it is frequentlyseen in alkaline urine as well. These deposits, as aclass, are distinguished by not being burned away whenheated on platinum foil. They are usually turned blackwhen first heated, from the admixture of organic matter,but only a small proportion is burned off. They are allsoluble in hydrochloric acid and reprecipitated by alka-lies, calcium carbonate being alone decomposed bythe acid. Oxalate of lime gives a very scanty, almost in-visible, precipitate ; under the microscope the crys-tals are found to be very minute and to consist oftwo forms, either the envelope crystals, whichare regular octahedra or dumb-bell crystals (). The former, owing to position, may assumethe appea
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