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DR. C. A. MACMUNN OR MYOHAEMATIN AND THE HISTOHaE MATINS. 
In Cerambyx moschatus the bands of myohaematin became much more distinct after 
they had been treated with ammonium sulphide, and then read : — 
1st band . . . X 613 to X 593, 
2nd band . . . X 570*5 „ X 564*5, (?) 
3rd band ... X 558*5 „ X 551 (?).'“ 
I noticed that the spectrum of these muscles became much feebler on exposure to air. 
In Creophilus maxillosus the same four bands were well marked (spectrum 12, 
Chart III.). 
In Cardbus violaceus , of which a great number have been examined, the spectrum 
is equally satisfactory. 
Although the muscle in Goccinella bipunctata is small in amount, yet the same 
spectrum was seen in it. 
In Periplaneta orientalis we sometimes meet with the modified variety of myo¬ 
haematin of which the spectrum representing that of Lucanus is the same as in this, 
while in the bulk of the specimens examined the four-banded myohaematin is 
present. 
In Staphylinus olens whose testes, as already said, are coloured by hsemochromogen 
and possibly haemoglobin, both the thoracic and leg muscles yield the spectrum of 
myohaematin only. 
Geotrupes stercoral ius shows the myohaematin spectrum in the thoracic and leg 
muscles beautifully marked. Spectrum 13, Chart III. 
The wave-length measurements have been given above. 
In Gryllus domesticus the thoracic muscle yields the same spectrum, and in the 
large thigh muscles it is well marked. 
In dipterous, hymenopterous, and lepidopterous insects, those which use their muscles 
actively in moving the wings have the greatest amount of myohaematin. 
In Tipula oleracea although its thoracic muscle is small, it shows a beautifully 
defined myohaematin spectrum ; Musca domestica, M. vomitoria, and M. chlora are 
equally satisfactory; thus the alar muscle of a blue-bottle fly gave spectrum 10, 
Chart III. 
In Apis mellijica, Bombus terrestris, and Vespa vulgaris myohaematin is present 
abundantly. The alar muscle of Bombus sometimes shows the modified myohaematin 
spectrum of which the bands in this case read :— 
1st band ... X 556 to X 550, 
2nd band . . . X 532 „ X 513 (?). 
In other specimens the normal spectrum was seen. (Spectra 14 and 15, Chart III.) 
The same remark applies to Apis. 
* Although (?) are placed after these it will be seen that they correspond closely enough with other 
measurements. 
