1887. | BOTANICAL GAZETTE. 81 
the cell sap, leaving the chlorophyll masses untouched. This 
red coloring matter can not be discovered in any of the crude 
materials brought into the plant, or in any other part than 
the leaves, except sometimes in the phloem regions of the 
petioles. When the leaf falls and the cell sap evaporates, 
and the chlorophyll bodies die, the erythrophyll lays hold of 
the cell wall and solid contents and stains them. In this way 
dried leaves retain their red color __As erythrophy]l is solu- 
ble in water, however, contact’ 
with moisture will soon cause the 
most of it to disappear. In the 
case of many cells containing 
erythrophyll we found the chlo- 
rophyll masses retaining their 
green color. In fact, the green 
was so slow in disappearing that 
It was only in the most advanced 
stages that it had given place to 
the yellow of xanthophyll. In 
- Some cases, where chlorophyll 
masses were in contact with ex- 
ternal cell walls, they had _ be- 
come yellow, while in the same 
cell those masses completely sur- 
rounded with erythrophyll re- 
mained green. The explanation 
of this seems to lie in the fact 
ry 
position of chlorophyll goes on FIG. 4. 
erythrophyll color of the cell sap being replaced by a dirty 
brown. Whether this is a resultant from the action of erythro- 
Phyll upon certain cell contents, or an entirely different color- 
Ing matter, was not ascertained. 
Ng a te 
*Vines’ Physiok gy of Plants, p. 266. 
