176 Xanthophylt Group of Yellow Colouring Matters. [Apr. 17, 



tion, after which the pigment was taken up with ether, and on slow 

 evaporation a few vermillion-coloured crystals formed, which gave the- 

 same spectrum as before, but the quantity was so small that it could 

 not be definitely decided whether these crystals represented the* 

 pigment or were some other substance coloured by it. 



Whether the lipochromes from other sources will also prove to- 

 consist of the same colouring matter opportunity of investigation has 

 not so far been afforded, but from the spectroscopic properties of the 

 lipochrome in the above cases it appears to be identical with 

 L. xanthophyll, and as it thus appears to be present along with both 

 chlorophyll and haemoglobin an interesting speculation is presented 

 whether this colouring matter, too, is of physiological importance. 



EXPLANATION OF THE PLATES. 



(The solvent in each case is alcohol.) 



PLATE 6. 



Spectra. 



1 and 5. Chrysophyll from the Daffodil leaf. 



2. L. xanthoph}!! from Wallflower. 



3. B. ,, Doronicum. 



4. Y. Tulip. 



6. B. Dcronicum. 



7. B. +HC1. 



8. Y. Tulip + HC1. 

 <t v 



*> *- ,, 



10. L. Wallflower. 



14- k. M (stronger solution). 



13, 12, 11. Action of HNO 3 upon L. xanthophyll of 14, after tueceesive intervals.. 



PLATE 7. 

 Spectra. 



1. Chrjeophyll from Spinach. 



2. Carotin from the Carrot. 



3. Lycopin, the colouring matter of the Tomato. 



4. Chrysophyll from Grass. 



5. L. xanthophjll from the Nasturtium. 



6. Colouring matter of the Egg- Yolk. 

 7- j, fowl serum. 



11, 12, 13. Action of HNO 3 upon 5, 6, 7, respectively. 

 &> 9 > 10 - after a further iuterral. 



