g6 
ON THE RESERVE PROTEIN IN PLANTS. 
In the shade active albumen is formed in smaller quantities 
than in full sun-light ; I found much of it in the leaves of 
Ailanthus glandulosa in the latter case, but none in shade-plants. 
Further, the young leaves are richer in it than old ones. 
Leaves suffering from albinism show it in the white parts of 
their leaves about just as much as in the green parts (observa¬ 
tion with Acer palmatum). 
