. Essentials of laboratory diagnosis; designed for students and practitioners. of bloodunder examination, and the number of the scale is read off thatcorresponds to this point on the glass wedge. (It is a. matterof common experience that the grading of these instrument- istoo high, and that a specimen of blood that corresponds to 90 or95 on the scale is normal.) He^ioglobixozvieter of Fleisc fee-Mies cffee.—A recent improvement in the Fleischl hemoglobinometer has been made by scher. This instrument (Fig. 10) is similar in general appearance to the original Fleischl. It has the same stand and
. Essentials of laboratory diagnosis; designed for students and practitioners. of bloodunder examination, and the number of the scale is read off thatcorresponds to this point on the glass wedge. (It is a. matterof common experience that the grading of these instrument- istoo high, and that a specimen of blood that corresponds to 90 or95 on the scale is normal.) He^ioglobixozvieter of Fleisc fee-Mies cffee.—A recent improvement in the Fleischl hemoglobinometer has been made by scher. This instrument (Fig. 10) is similar in general appearance to the original Fleischl. It has the same stand and the same scale principle, although this latter is standardized ESTIMATION OF THE HEMOGLOBIN. 53 diffcivnily and graduated on a different basis. It differsmaterially in the method of measuring and diluting the blood,in the form o\ the comparison chamber, and in the meaning ofthe graduation of the scale. The diluting pipette is similar in construction to the pipetteof the Thoma-Zeiss hemocytometer, its calibrations, however,being different. The marks are y2, %, and 1. Above. Fig. 10.— Fleischl-Meischer Hemoglobinometeu. and before each of these main divisions are two marks, eachcorresponding to Y100 of the contents of the capillary device enables the worker to measure accurately thecolumn of blood taken, in ca?e he gets too little or too muchblood in the tube. The relation of the capillary to the ampullais such that blood, drawn to the mark 1 and diluted to themark above the ampulla, gives a dilution of 200; if drawn tothe mark %, the dilution is 300, while the line i/2 furnishes adilution of 400. The diluent used is %0 per cent, sodium car-bonate solution. This dissolves the stromata of the reel cellsand produces a clear solution. If the diluent becomes turbid 54 THE BLOOD. after standing some time, it should be freshly made and shouldcontain no bicarbonate. Calculation of Eesults.—This is possible only with theuse of the table of calibrations, which contains the
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