IV] CHLOROPHYLL 41 



The separation of the two pigments (see Expt. 22) is based on the 

 fact that in a mixture of petrol ether and methyl alcohol containing a 

 little water, the carotin passes entirely into the petrol ether, whereas the 

 greater part of the xanthophyll remains in the methyl alcohol layer. 



REFERENCES 



Books 



1. Willstatter, R., und StoU, A. Untersuchungen liber Chlorophyll. 

 Methoden und Ergebnisse. Berlin, 1913. 



Papers 



2. Jorgensen, I., and Kidd, P. Some Photochemical Experiments with Pure 

 Ohlorophyll and their Bearing on Theories of Carbon Assimilation Proc. R. Soc, 

 1917, B Vol. 89, pp. 342-361. 



3. Jorgensen, I., and Stiles, W. Carbon Assimilation. A Review of Recent 

 Work on the Pigments of the Green Leaf and the Processes connected with them. 

 New Phytologist, Reprint, No. 10. London, 1917. 



4. Schryver, S. B. The Photochemical Formation of Formaldehyde in Green 

 Plants. Proc. R. Soc, 1910, B Vol. 82, pp. 226-232. 



5. Usher, P. L., and Priestley, J. H. A Study of the Mechanism of Carbon 

 Assimilation in Green Plants. I. Proc. R. Soc, 1906, B Vol. 77, pp. 369-376. II. 

 Ibid. 1906, B Vol. 78, pp. 318-327. III. Ibid. 1912, B Vol. 84, pp. 101-112. 



