A text-book of physiology, for medical students and physicians . obtained, while hemoglobinfrom the blood of man andof most of the vertebratescrystallizes much less for preparing andpurifying these crystals willbe found in works on phys-iological chemistry. To ob-tain specimens quickly forexamination under the mi-croscope, one of the mostcertain methods is to takesome blood from one of theanimals whose hemoglobincrystallizes easily, place itin a test-tube, add to it afew drops of ether, shake the tube thoroughly until the blood be-comes laky,—that is, until the hemoglobin is dis
A text-book of physiology, for medical students and physicians . obtained, while hemoglobinfrom the blood of man andof most of the vertebratescrystallizes much less for preparing andpurifying these crystals willbe found in works on phys-iological chemistry. To ob-tain specimens quickly forexamination under the mi-croscope, one of the mostcertain methods is to takesome blood from one of theanimals whose hemoglobincrystallizes easily, place itin a test-tube, add to it afew drops of ether, shake the tube thoroughly until the blood be-comes laky,—that is, until the hemoglobin is discharged into theplasma,- and then place the tube on ice until the crystals aredeposited. Small portions of the crystalline sediment may then beremoved to a glass slide for examination. According to Reichert,the deposition of the crystals is hastened by adding ammoniumoxalate to the blood in quantities sufficient to make from 1 to5 per cent, of the mixture. Hemoglobin from different animalsvaries not only as to the ease with which it crystallizes, but in some. Crystallized hemoglobin (after f man; ry: Frey): a, b. Crystals from venous Mood c, from the Mood of a cat; /, from the a guinea ijik; e, from the bl/, Irom the blood of a Sfjuirrcl }lood of jf a hamster; GENERAL PROPERTIES: THE CORPUSCLES. 419 cases also as to the form that the crystals take. In man and in mostof the mammalia hemoglobin is deposited in the form of rhombicprisms; in the guinea pig it crystallizes in tetrahedra (d, Fig. 177),and in the squirrel in hexagonal plates. This difference in crystal-line form implies some difference in molecular structure, and takentogether with other known variations in property shown by hemo-globin from different animals lead us to believe that the huge mole-cule has a labile structure, and that it may differ somewhat in itsmolecular composition or atomic arrangement without losing itsphysiological property of an oxygen-carrier. In this connectionit is interesting to state that
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