. Diseases of metabolism and of the blood, animal parasites, toxicology. Constitutional diseases; Metabolism; Blood; Medical parasitology; Poisons; Metabolic Diseases; Hematologic Diseases; Poisons; Parasitic Diseases. 278 BLOOD AND BLOOD EXAMINATION reckon the absolute amount of hemoglobin in milligrams in 1 of blood. [It is essential to remember that percentage readings are very misleading when applied to children, since their normal is about 75 per cent, of the normal of adult men. Women's blood contains 10-15 per cent, less coloring matter than men's. All hemoglobin instruments shoul
. Diseases of metabolism and of the blood, animal parasites, toxicology. Constitutional diseases; Metabolism; Blood; Medical parasitology; Poisons; Metabolic Diseases; Hematologic Diseases; Poisons; Parasitic Diseases. 278 BLOOD AND BLOOD EXAMINATION reckon the absolute amount of hemoglobin in milligrams in 1 of blood. [It is essential to remember that percentage readings are very misleading when applied to children, since their normal is about 75 per cent, of the normal of adult men. Women's blood contains 10-15 per cent, less coloring matter than men's. All hemoglobin instruments should be graduated in milligrams per of blood instead of in percentages of a supposed " ;—Ed.] The investigation is rather laborious because it can only be carried out with arti- ficial illumination. The apparatus is quite expensive on account of the diffi- culty in manufacturing the glass wedge. Its use, however, is valuable, for an investigator in constant practice is able to reduce the errors to 5 per cent, and less. The little apparatus of Growers- works on the following principle: A tube contains a standard color solution which possesses the tint of a diluted watery. Fig. 9.—Hemometer. (After v. Fleischl-Miescher.) hemoglobin solution. In a graduated glass tube of the same size a small but accurately determined amount of blood is diluted with water until it is the same color as the color in the test-tube; naturally this occurs the sooner the thinner the blood is at the beginning. If, for example, an equalization of color is reached at 60, this indicates that the blood only contains 60 per cent, of hemoglobin in comparison to normal blood. This test is quite simple and it may be completed in a few minutes during the office hour; the apparatus is very cheap. With a well made instrument the errors may be reduced to from 10 to 5 per cent. I must call attention to the fact that the manufacture of this apparatus is carried on by some quite unreliable manuf
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