405 
In the young leaves of other varieties of the genus a similar 
structure is readily visible, but in the mature and in the old the 
appearance becomes obsolete. The change seems to begin early 
in the life of the chlorophyll-grain and to advance rapidly, the 
chromatophore soon becoming filled with starch. That the action 
of the light which augments the formation of the starch has any 
concomitant influence on the trabecular structure of the chroma- 
tophore itself I do not know. 
This structure of the chlorophyll-grain is probably not un- 
common, 
Explanation of Figures. 
Fic. 1. Sele ginella Krusiana ; chromatophores connected together by short, deli- 
cate threads of protoplasm. (After Haberlandt.) 
Fic, 2, Chromatophore of Astrophyllum sylvaticum in optical section, showing 
the Surrounding membrane between two dividing grains, with optic sections of the 
elevated ridges and of the black space between the body of the chromatophore and 
the membrane. 
Fic. 3, Optical section of a chromatophore of Astrophyllum after treatment with 
alcohol and with eosin staining; showing the projecting elevations or ridges and the 
external membrane, the space between the body and the membrane being left white, 
