. A manual of clinical diagnosis by means of microscopical and chemical methods, for students, hospital physicians, and practitioners . ed into that of haemoglobin when an alkali and a reducingsubstance are added. The spectrum of haematin under the sameconditions is transformed into that of an alkaline solution of haemo-chromogen. In alkaline solutions, on the other hand, two bandsof absorption are observed, which are similar to those of oxy-hemoglobin, but differ from these in the fact that the band nearer£, ,3, is more pronounced than the one at D, a. A third, butvery faint, band may further
. A manual of clinical diagnosis by means of microscopical and chemical methods, for students, hospital physicians, and practitioners . ed into that of haemoglobin when an alkali and a reducingsubstance are added. The spectrum of haematin under the sameconditions is transformed into that of an alkaline solution of haemo-chromogen. In alkaline solutions, on the other hand, two bandsof absorption are observed, which are similar to those of oxy-hemoglobin, but differ from these in the fact that the band nearer£, ,3, is more pronounced than the one at D, a. A third, butvery faint, band may further be observed between C and D,near D. Haematoidin.—Small amorphous particles of an orange or ruby-red color, or crystals belonging to the rhombic system (Plate I.,Fig. 2), occurring either singly or in groups, are frequently metwith in the sputum, the urine, and the feces, as well as in oldextravasations of blood. They were discovered by Virchow, whoapplied the term haematoidin to this particular pigment, thehaemic origin of which is undoubted. It is supposedly identicalwith bilirubin. Fig. 12. Red Orange Yellow Green Cyan-blue. Spectrum of hsematoporphyrin in solution. Haematoporphyrin.—Ha?matoporphyrin is likewise a derivativeof haematin, and, according to Xencki and Sieber, isomeric with 46 THE BLOOD. bilirubin. In dilute solution with sodium carbonate it shows fourbands of absorption, one between C and D, a second one, broaderthan the first, about D, especially marked between D and E, a thirdone, not so broad and less sharply defined between D and E, and afourth one, broad and dark, between b and E (Fig. 12). The clinical significance of this body, which, also appears in theurine, as well as the causes giving rise to its formation, are as yetunknown (see Haematoporphyrinuria). ■ It has been found postmortem in the blood, in a case of sulphonal poisoning, by A. and J. AYhile it is usually possible, as pointed out above, to recognizedefinitely the pres
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