Carpenter's principles of human physiology . 238 OF THE BLOOD Fig. temperature of 100° C. in the absence of oxygen on solutions of hsemoglobin.*Haemochromogen has so powerful an affinity for oxygen that it has not beenisolated. Its alkaline solution exposed to oxygen is converted into hasmatin, itscolour at the same time undergoing considerable change. Acid haemo-chromogen absorbs red and orange, at least as far as the line D, and violetand blue to G. There is an absorption line between D and E, and another at E, which is fainter, and disappearson dilution. Hcematoporpliyrin. — The iron-
Carpenter's principles of human physiology . 238 OF THE BLOOD Fig. temperature of 100° C. in the absence of oxygen on solutions of hsemoglobin.*Haemochromogen has so powerful an affinity for oxygen that it has not beenisolated. Its alkaline solution exposed to oxygen is converted into hasmatin, itscolour at the same time undergoing considerable change. Acid haemo-chromogen absorbs red and orange, at least as far as the line D, and violetand blue to G. There is an absorption line between D and E, and another at E, which is fainter, and disappearson dilution. Hcematoporpliyrin. — The iron-freehasmatin obtained by the action of con-centrated sulphuric acid upon hasmatinconsists essentially of Hsematoporphyrinmingled with a substance namedhcematolin, which is insoluble in mostmenstrua, and has a composition ex-pressed by the formula CggH^ is soluble in alka-line solutions, and has the compositionC6SH74N8012. Its acid solution ^ presenta narrow and feeble absorption bandjust before the line D, and a darker andbroader one between D
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