Examination of the urine; a manual for students and practitioners . large dosesof cod-liver oil (Roberts); in cystic cheesy degenerationof the kidney; in abscesses communicating with the ureter;in heart disease, and in calculous disease of the admixture of fat from lubricants of catheters or fromfatty material used in the vagina for examinations must notbe mistaken for fat in the urine. Cholesterin (C26H440) is a monatomic alcohol, normallypresent in bile, blood-corpuscles, nerve tissues, and else-where in the body. In disease it occurs in gall-stones, in 204 EXAMINATION OF THE UR
Examination of the urine; a manual for students and practitioners . large dosesof cod-liver oil (Roberts); in cystic cheesy degenerationof the kidney; in abscesses communicating with the ureter;in heart disease, and in calculous disease of the admixture of fat from lubricants of catheters or fromfatty material used in the vagina for examinations must notbe mistaken for fat in the urine. Cholesterin (C26H440) is a monatomic alcohol, normallypresent in bile, blood-corpuscles, nerve tissues, and else-where in the body. In disease it occurs in gall-stones, in 204 EXAMINATION OF THE URINE pus, in tuberculous and cheesy masses, in old transudates,tumors, etc. It may be present in urine under pathologicconditions, in such cases as cheesy cystic kidney, but this isof very rare occurrence. Extensive fatty degenerationof some part of the urinary tract, as subacute or chronicnephritis or the fatty stage of acute nephritis, may rarelygive cholesterin crystals in the urinary sediment. Choles-terin crystallizes in large plates, the appearance of which. Fig. 30.—Cholesterin crystals (Jakob). is characteristic (Fig. 30). It is insoluble in water, butreadily soluble in alcohol, ether, chloroform, etc. Choles-terin is detected by means of the microscope. OTHER ORGANIC CONSTITUENTS OF MINOR IMPORTANCE Besides the organic substances already described, very small amountsof a number of organic bodies may occur in normal urine and are some-times increased pathologically. They may be divided into five groups: (a) The non-nitrogenous organic acids, e. g., oxalic, lactic, succinic, etc. (b) The fatty acids, including formic, acetic, butyric, and propionic. (c) The aromatic oxyacids—hydroparacumaric and paraoxyphenylacetic,etc. (d) Aromatic substances present as ethereal sulphates, e. g., phenol,etc. (e) Ferments. ORGANIC CONSTITUENTS OF MINOR IMPORTANCE 205 Oxalic acid (C,H004) is probably present in very small quantitiesin normal urine. Whenever there is an interference wit
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