Diagnostic methods, chemical, bacteriological and microscopical, a text-book for students and practitioners . stalline material arranged inmasses much resembling casts. The most important of these are uric acidand the urates. It is true that any cast in a concentrated urine may becomecovered with urates so that the true nature of the cast becomes the slide be warmed these pseudourate casts will disappear, while the truecasts will remain. Masses of bacteria, pus-cells, epithelial cells and blood-cells may so group themselves as closely to resemble true casts. As a rulesuch masses
Diagnostic methods, chemical, bacteriological and microscopical, a text-book for students and practitioners . stalline material arranged inmasses much resembling casts. The most important of these are uric acidand the urates. It is true that any cast in a concentrated urine may becomecovered with urates so that the true nature of the cast becomes the slide be warmed these pseudourate casts will disappear, while the truecasts will remain. Masses of bacteria, pus-cells, epithelial cells and blood-cells may so group themselves as closely to resemble true casts. As a rulesuch masses will show irregular outHnes and no evidence of a distinct , the use of an old slide upon which there may be many scratches. Fig. III.—Blood, Pus, Hyaline and Epithelial Casts. {Greene.) a, Blood casts; b, pus cast; c, hyaline cast impregnated with renal cells; d, epithelial casts. should be avoided as the writer has seen several instances in which supposedcasts were found to be due to such scratches. Cylindruria. This is the name given to the appearance of casts in the urine. As a rule,it should be said that the presence of a few hyaline casts is not of particularmoment unless associated with other evidences of marked renal albuminuria and cylindruria usually go hand in hand, yet we do findcases in which one exists without the other. It is undoubtedly true that casts indicate a disturbance of the renal epithe-lium. This, however, need not be anything more than disturbed nutritionalor circulatory conditions. However, when the true hyaline casts are present in 362 DIAGNOSTIC METHODS. large numbers and when many other types of casts also exist, then a distinct patho-logic lesion of the ki
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