. Essentials of medical and clinical chemistry. With laboratory exercises . n into the veins of a rabbit a solution ofsulph-indigotate of sodium. If the animal be killed within a few minutes,none of the coloring matter will be found in the capsules, while the cellslining the tubes will be stained blue. If, however, an hour be allowed toelapse, even the cells will be found colorless and the coloring matter will beseen only in the urine. Our conclusion drawn from this is that the productionof urine is chiefly an elaborating or secreting process, regulated in its fluidityby the glomerular system;
. Essentials of medical and clinical chemistry. With laboratory exercises . n into the veins of a rabbit a solution ofsulph-indigotate of sodium. If the animal be killed within a few minutes,none of the coloring matter will be found in the capsules, while the cellslining the tubes will be stained blue. If, however, an hour be allowed toelapse, even the cells will be found colorless and the coloring matter will beseen only in the urine. Our conclusion drawn from this is that the productionof urine is chiefly an elaborating or secreting process, regulated in its fluidityby the glomerular system; that the water and some of its salts are secretedby the glomeruli, the peculiar anatomical construction of which permits avarying degree of activity corresponding chiefly with the varying degree ofblood pressure and blood fluidity; while in the main, the solid excretory pro-ducts of the urine are elimated by the epithelium of the renal tubules, throughtheir vital, selective or secretory power, as in all other glandular structures ofsimilar anatomical construction. (180). PART III. CLINICAL CHEMISTRY. l8l position and properties may occur during the day. Especially isthis true of traces of albumin and sugar. When this is impractic-able, that passed before breakfast is generally preferable, becausefarthest from a meal. When significant variations during the dayare suspected, several specimens may be taken33^ at different hours. For microscopical exami-nation, a few ounces of the urine in a stop-pered vial, or covered conical glass, Fig. 44,are set aside for several hours until the sedi-ment, having settled to the bottom, can beexamined. A much more improved and satis-factory method is by the use of the centrifuge,as thereby the precipitate can be obtained atonce from fresh urine. Physical Properties. Normal urine is a transparent, aqueous fluid, of a pale yellowcolor, characteristic odor, faint acid reaction, and of a specificgravity of 1020 when passed in the average quantity o
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