272 GOLDSTEIN: PLANTS AFFECTED WITH Mosaic DISEASE 
The magnification is about 450 diameters. All the drawings with the excep- 
tion of figures 7 and 8 are from living preparations. Figures 7 and 8 are draw- 
ings from material fixed with Flemming’s weak solution, cut at lou, and 
pecs with fic seamete, s — stain. 
llowed the midrib of a mottled 
leaf. ‘The facies is Bas granular and contains three nucleoli. The X 
body is very densely granular, yrs eas many vacuoles. Scattered through 
the cytoplasm are small oval p 
A portion of a ede ae showin five X bodies about the nucleus 
which lies suspended in the cell by streaming cytoplasmic threads. Two o 
the bodies show a fine alveolar structure. The other three are granular. 
Imbedded in the bodies were highly refractive granules. 
Fic. 3. A portion of a hair cell showing the distribution of many X bodes 
of varying size through the vacuole of the cell. Three large and five small 
bodies are present. mencred through the cytopisem are very small oval 
plasti ds. The nucleus pr imordial l utricle, against the wall. 
IG. A normal hair cell from healthy tissue. The cell contents save 
for the absence of the X bodies present an exactly similar appearance to that 
of the diseased cell shown in figure 
1G. 5. A portion of a hair cell ae which a single large X body, a crystal 
and the nucleus of the cell are shown. The X body drawn here shows the 
appearance of the body when very active and fecect an changing its form 
and ses ion. The small oval bodies are plasti 
G. 6. A portion of an epidermal cell of om need showing 2 X bodies, 
and 3 eee 
1G. 7. A portion of a cell from a petiole spine of Solanum sculeatis- 
simum affected with tobacco mosaic. The striated body shows the appearance 
of the crystals after fixation. The nucleus lies against the opposite wall. 
The X body contains two vacuoles. The striated body and the X body are 
stained deep orange, the chromatin purple, and the nucleole red. The cyto- 
plasm and cell walls are orange. 
Fi An epidermal cell from the petiole near the growing region of 
a diseased tobacco plant. This cell contains an elongated striated body, 
a nucleus, and a large vacuolated X body. In the cytoplasm around the 
nucleus and the X body were smaller orange stained bodies each containing 
a single large round vacuole. 
BIBLIOGRAPHY 
1. Iwanowski, D. Uber die Mosaikkrankheit der Tabak- 
spflanze. Zeit. Pflanzenkrankheiten. 13: 1-41. pl. 1-3. 
I 
03. 
2. Kiihne, W. Untersuchungen iiber das Protoplasma und die 
Contractilitat. Leipsig, 1864. 
a el, L. O. possible causative agent for the mosaic 
disease of corn. Bull. Expt. Sta. Hawaiian Sugar Planters’ 
Assoc. Bot. Series 3: 1-14. pl. 4-15. 1921. 
