244 Schunck . — The Chemistry of Chlorophyll . 
which it may be inferred that his substance was not altogether 
free from an admixture of blue chlorophyll. I find no allusion 
in recent memoirs to the observations of Stokes and Sorby, 
as to there being two distinct yellow colouring-matters accom- 
panying chlorophyll. It is remarkable, though perhaps not 
altogether unfortunate, that so far we have not been favoured 
with any speculations as to the functions of these yellow 
colouring-matters in plants. Considering how little we really 
know regarding the function of chlorophyll itself in connection 
with its physical and chemical properties, such speculations 
would be somewhat premature. 
