278 
DR. C. A. MAC MUNN ON MYOHyEMATIN AND THE HISTOHXEMAT1N3. 
In the liver the bands read :— 
1st band ... X 613 to X 596 - 5, 
2nd band ... X 569 ,, X 548 '5, 
3rd band . . . X 537 „ X 521 ‘5 (?). 
(Chart III., spectrum 6.) 
It is worthy of notice that the second band exactly occupies the place of the second 
and third bands of the histohcemotin spectrum of the pancreas. 
A similar spectrum is yielded by the kidney (cortex) in which the bands read :—- 
1st band . . . X 613 to X 596'5, or X 593, 
2nd band . . . X 569 ,, X 563, 
3rd band ... X 556 ,, X 550. (Chart III., spectrum 7.) 
In the wall of the small intestine the bands are exactly the same as in that of 
the stomach. 
In the ovary there is also a peculiar spectrum, which is like that of hsemochromogen, 
but the bands are much fainter than those of the medulla of the adrenals. (Spectrum 8, 
Chart III.) 
The adrenals, after injection with salt solution, clo not show the hcemochromogen 
spectrum nearly as distinctly as in a cat whose blood-vessels are not thus treated. 
This observation obviously proves that a portion of the hcemochromogen has been 
washed out by the injection, and that, therefore, it must be looked upon as an excretion. 
(See Chart III., spectrum 9.) 
Comparing now the measurements of the above spectra in wave-lengths with 
those of myohsematin, one cannot help concluding that these spectra belong to the 
same class of pigments, or indeed to the same pigment; hence these observations prove 
that myoheematin belongs to the histoheematins; and had my vision been more acute, I 
believe I could have proved the same thing for the histohsematin spectra of all the 
animals examined. 
Having now proved the point which has been foreshadowed by previous observations, 
I may refer to some other observations as briefly as possible. 
Histoheematins have been found in the mesenteric lymphatics of the pig, and in the 
kidney, liver, and spleen of the same animal, and hsemochromogen in its adrenals; in the 
liver, kidney, spleen, and mesenteric glands of the ox and sheep and hsemochromogen 
in their adrenals. 
In man I failed to find a histohsematin spectrum in the thyroid, the spectrum being 
that of oxyhemoglobin ; the same remark applies to the pituitary body. In the 
thymus of a child, aged 10 months, I perceived a faint histohsematin spectrum, but not 
in its thyroid. In the spleen, liver, and kidney of man, the spectra are the same 
as in other Mammals, and in the human adrenals hsemochromogen can be detected m 
the medullary part, while the cortex furnishes evidence of the presence of a histohse- 
