244 DR. C. A. MAC MITNN ON ENTEROCHLOROPHYLL, AND ALLIED PIGMENTS. 
the edges of the feeble bands, the following two showed certain peculiarities with 
regard to the dominant band in red. 
(10) A Uraster of a brown and orange colour had its coeca extracted with absolute 
alcohol. The solution obtained was a deep yellow, with a red fluorescence, and gave 
spectrum I 8, Chart I., which is the result of combining the spectrum of a deep and 
shallow layer. The bands read as follows: 1st, X 683*5 to X 675; 2nd, X 664 to 
X 651-5 ; 3rd, X 613 to X 593 (?) ; 4th, X 545'5 to X 532 (or X 543 to X 529*5), and 
the 5th, about X 505 to X 473‘5. I could not see any other band nearer violet. That 
this spectrum did not belong to chlorofucin was seen by the action of caustic soda 
on it, as the bands were hardly affected, wdrereas in a similar solution of chlorofucin 
they become completely changed under the influence of this reagent. 
On treatment with nitric acid the similarity in constitution of this pigment to 
other enterochlorophylls was proved, although the bands are not coincident; they 
read : 1st, about X 681 to X 669 ; 2nd, X 660 to X 645 ; 3rd, X 609 to X 589 ; the 
others were uncertain. On evaporating on the water-bath, a yellowish residue with 
particles of a brown colour in it, was obtained, and on extracting with petroleum- 
ether and filtering, a yellow solution was obtained giving two bands in the red, 
with these readings: 1st, X 683’5 to X 672; 2nd, X 665 to X 654 ; also a broad 
shading between green and blue. The two former being of equal intensity, and 
nearly equal breadth. This is shown in spectrum 19, Chart I. On diluting with 
more petroleum-ether a band became detached from about X 501 to X 481. Now 
according to Hansen “ chlorophyll green ” is insoluble in petroleum-ether, but this 
chlorophyll was soluble in it. In a. still more dilute solution (of petroleum-ether) 
another band, nearer violet, from about X 467 to X 451, could be seen. On touching 
the dried residue with a solution of iodine in iodide of potassium it showed a reddish 
tinge; with nitric acid it became green, and with sulphuric acid green. On dissolving 
some residue left after evaporation of a petroleum-ether solution in bisulphide of carbon 
a reddish-yellow solution was obtained showing only one broad band in green and blue. 
(11) The coeca of another Uraster on being extracted with absolute alcohol yielded 
a deep-yellow solution with a red fluorescence, and a similar spectrum to that just 
described, the bands of which read : 1st, X 683'5 to X 675 ; 2nd, X 665 to X 651‘5 ; 
3rd, X 613 to X 593 ; 4th, X 543 to X 529'5 ; and 5th, X 505 to X 475 (?). An attempt 
was made to get reduction-products from this solution with zinc and sulphuric acid, 
but with a negative result. 
(12) A brown Uraster. —The coeca, extracted with absolute alcohol, yielded a deep- 
yellow solution having a red fluorescence. The bands read: 1st, X 667 to 651'5; 
2nd, X 615 - 5 to X 593 ; 3rd, X 545'5 to X 535 ; and another from about X 509 to 
X 484'5. I failed to get a reduction-product from this by treating with magnesium 
and acetic acid. 
(13) The deep-yellow solution of the coeca of another Uraster , fluoresced red, and 
