Manual of pathology : including bacteriology, the technic of postmortems, and methods of pathologic research . Fn;. 2i;.—Hkmatocrit Tiuk. i Iwui. IuIh- illustratc<i lillcd with IiIimmI and rotated, as dirorlcd in the text, until the crythrf>cyte» haveCdlletlcd at one end. occupyinK 45 ilegrees (or (jraduation-marks). This, muhiplied l>y , gives —the numl)cr of erythrocytes to the culiic niiilimeler of l)lood. and the percentage of each form present is calculated. Differentialcounting of diseased red cells is sometimes resorted to, and mav b
Manual of pathology : including bacteriology, the technic of postmortems, and methods of pathologic research . Fn;. 2i;.—Hkmatocrit Tiuk. i Iwui. IuIh- illustratc<i lillcd with IiIimmI and rotated, as dirorlcd in the text, until the crythrf>cyte» haveCdlletlcd at one end. occupyinK 45 ilegrees (or (jraduation-marks). This, muhiplied l>y , gives —the numl)cr of erythrocytes to the culiic niiilimeler of l)lood. and the percentage of each form present is calculated. Differentialcounting of diseased red cells is sometimes resorted to, and mav bedone in the same manner. Hematocrit.—This instrument (see cha])tcr on Examination of theUrine) readily enables one to estimate the Ioliinw oj the red consists of: 1. Two glass tubes, 50 mm. long, with a lumen of mm., andgraduated into 100 parts. (Fig. 222.) 2. A metallic frame (Fig. 223), in which the glass tubes are fastened—on the outer side by a metallic cup in the frame, and at the proximalextremity by a spring, which is attached to a hollow metal cylimler,. FlO. 71,^.— ROTATINC. pRANre OF TlIK IIkMATOCRIT. The tube on the right is in ijosilion; the tul)c on the left shows the graduation and the direction which the smnllrrend should take when in |iosition. The entire metiJ frame is to l)e placed on the vertical suplirtrt, .is describedin the chapter on Kxamination of the Irine. which projects downward from the center of the frame, and by meansof which the frame can be made to rotate on a vertical axis. Thecups receiving the ends of the glass tubes contain rul)ber washers thatalso act as cushions. 3. A vertical support, which can be made to rotate. A sj>eed ofat least 10,000 rotations a minute is necessarv. 4. A metallic box, to be fastened to a table, and containing themachinery by which the vertical support is rotated. To Use the Hematocrit.—()ne of the graduated tubes, previouslywell cleaned, is attached by means of a short piece of pure
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