268 GOLDSTEIN: PLANTS AFFECTED WITH Mosaic DISEASE 
line ectoplasm-like cap (h) was seen on a more or less pro- 
truding portion of the X body. A small crystal (c) either adher- 
ing to its surface or embedded in the X body was also seen at 
several stages. The whole series of figures while not suggestive 
of the active pseudopod formation seen in Amoeba proteus is 
certainly not unlike that of more sluggish types. 
The body at first was near the distal end of the trichome 
cell. During the stages shown in figures I-15 it moved to the 
proximal end of the cell. Figures 16-34 show its later move- 
ments in the proximal end of the cell. Its general path during 
the whole period of observation is diagrammatically shown in 
text figure 2. How much of this motion is due to autonomous 
activity of the X body, and how much to cytoplasmic streaming 
in the trichome cell is not easy to determine. Certainly the 
movement of the nucleus in the same direction is due to cyto- 
plasmic streaming. 
Cells from the paler areas of the mosaiced leaf also show the 
presence of great numbers of crystals. Although similar crystals 
are present in healthy tissue, they are not nearly as abundant 
as they are in cells of diseased tissue. These crystals appear as 
hexagonal plates of various thicknesses, as irregular polygonal 
plates, or as more or less irregular elongated forms with cross 
striations as in figures 5 and 6. These various appearances may 
be due to the varying positions of the crystals in the cells as well 
as to the occurrence of twinning, etc. I am reserving a fuller 
report on the nature of these crystals for a later paper. 
Figures 7 and 8 represent drawings made from fixed and 
stained material. In figure 7 there is present an elongated 
cross striated body lying within the protoplast. A similar striated 
body is shown in figure 8. Such bodies are very common in my 
sectioned material. In the diseased areas nearly every cell is 
found to contain such a striated body. Often there are two or 
three of them in a single cell. 
If one adds to the fresh preparations mounted in water, 
Flemming’s weak, medium, or strong solutions, or chromo-acetic 
solution, allowing the preparations to stand over night in a moist 
chamber, the typical crystal forms are no longer found. Instead 
one finds long irregularly lobed and striated masses which are 
stained deep yellow by the fixative. That at least many of the 
crystals actually become the striated bodies found in fixed 
