Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . nues the cell outlineceases to be visible, the nuclei fade, and finally only a mass urine: sediments. 331 of debris containing isolated nuclei and an occasional cellremains. It is frequently rather difficult to make a differentiationbetween pus corpuscles and certain types of epithelial cellswhich arc similar in form. Such confusion may be avoidedby the addition t iodine solution (I in KI ), a reagent whichstains the pus corpuscles a deep mahogany-
Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . nues the cell outlineceases to be visible, the nuclei fade, and finally only a mass urine: sediments. 331 of debris containing isolated nuclei and an occasional cellremains. It is frequently rather difficult to make a differentiationbetween pus corpuscles and certain types of epithelial cellswhich arc similar in form. Such confusion may be avoidedby the addition t iodine solution (I in KI ), a reagent whichstains the pus corpuscles a deep mahogany-brown and trans-mits to the epithelial cells a light yellow tint. The test pro-posed by Vitali often gives very satisfactory results. Thissimply consists in acidifying- the urine (if alkaline) withacetic acid, then filtering, and treating the sediment on thefilter paper with freshly prepared tincture of guaiac. Thepresence of pus in the sediment is indicated if a blue color isobserved. Large numbers of pus corpuscles are present inthe urinary sediment in gonorrhoea, leucorrhcea, chronicpyelitis and in abscess of the kidney. Fig. Hyaline cast is impregnated with four renal cells. 33* PHYSIOLOGICAL CHEMISTRY, Casts.—These are cylindrical formations, which originatein the uriniferous tubules and are forced out by the pressureof the urine. They vary greatly in size but in nearly everyinstance they possess parallel sides and rounded ends. Thefinding of casts in the urine is very important because of thefact that they generally indicate some kidney disorder; if albu-min accompanies the casts the indication is much have been classified according to their microscopical char-acteristics as follows: (a) Hyaline, (b) granular, (c) epi-thelial, (d) blood, (e) fatty, (/) waxy, (g) pus. (a) Hyaline Casts.—These are composed of a basic materialwhich is transparent, homogeneous and very light in color(Fig. 107, p. 331). In fact, chiefly because of these ph
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