264 GOLDSTEIN: PLANTS AFFECTED WITH Mosatc DISEASE 
around the periphery of the cell during the whole period of several 
hours during which the drawings were made. 
Kunkel seems to emphasize somewhat the fact that the X 
bodies lie in intimate association with the nucleus of the cell. 
My observations do not lead me to attach any very special 
significance to such a position, especially in the case of the hair 
cells. From my studies of living material, and also from the 
appearance of the nucleus in fixed preparations of both diseased 
tissue in which the bodies are present, and healthy tissue, I find 
no evidence that the nuclei in cells from mosaic diseased areas 
are at all changed in appearance by the presence of the X bodies. 
The bodies, as they move through the more fluid cytoplasm or 
cel sap, may come to rest upon the nucleus. It appears simply 
as an impediment to their movement. In one instance, a cell 
was observed in which there were several very large rounded X 
bodies lying about the nucleus which was thus quite obscured 
from view though it could be seen by carefully focusing down 
among the bodies. After some time, the bodies gradually 
moved away, so that the nucleus now came into clear view. 
_It was then seen to be very much flattened on one side apparently 
where the bodies or a body had been closely pressed against it. 
After several minutes, the nucleus slowly rounded out and re- 
gained its normal oval outline. It showed no further changes 
although the cell was studied several hours. 
I find no evidence from my studies that the X bodies could 
be considered as secretion or disorganization products arising 
from or in the neighborhood of the nucleus. I have studied very 
many preparations from healthy leaves but they have never 
been found to contain these bodies. 
Kiihne has described a balling up of the protoplasm of living 
stamen hairs of Tradescantia under the influence of electrical 
stimulation. In such electrically stimulated cells, when the 
charge was strong, the entire primordial utricle became loosened 
from the walls and hung suspended in the cell space by a few 
threads still attached to the walls. A weaker cliarge led to the 
- breaking up of the strands of protoplasm. The fragments then 
rounded up into globules or rounded masses. In such prepara- 
tions the balls of cytoplasm within a few hours elongated and 
flowed back again into the streaming cytoplasm. 
The X bodies in my preparations keep their form in living 
