GOLDSTEIN: PLANTS AFFECTED WITH Mosaic DISEASE 271 
bodies present in the original cell. Cells in stained sections of 
the growing tips show the presence of X bodies in cells con- 
taining mitotic nuclear division figures. This, however, could 
hardly account for the transmission of the disease from the point 
of infection to distant parts of the same plant. 
For instance, I have inoculated young leaves of plants, 
and two months later have secured severe infections of healthy 
plants when the juices of the apparently healthy basal leaves 
of the diseased plants were used as the inoculum. Moreover, 
the X bodies may be found in tissue from these leaves, although 
not so abundantly as in the mottled leaves. 
It is, of course, at first thought difficult if not impossible 
to conceive that such bodies as these, assuming they carry the 
mosaic, can pass through plant tissues as the mosaic virus has 
been shown to do. In this connection, however, Miehe’s obser- 
vations on migrating nuclei must be kept in mind. Miehe’s 
description of the nuclei of Tradescantia and other cells, passing 
through the minute pores, Tongl lines, in cell walls has been 
confirmed by Schiirhoff. 
These observations certainly suggest also that such plastic 
bedies as the X bodies in spite of their comparatively large size 
may very well be able to pass through cell walls and the pores of 
bacterial filters as the virus has been shown to do. Still such 
comparisons are not very convincing in the absence of positively 
known cases of parasites which behave in the fashion suggested. 
As noted I am reserving for a further paper a fuller account of 
the behavior of the X bodies in growing points together with a 
fuller crystallographic account of the numerous bodies which 
accompany them, in cells suffering from mosaic. 
I gratefully acknowledge my indebtedness to Professor R. 
A. Harper for his many valuable suggestions in this study and 
in the preparation of this paper. 
BOTANICAL LABORATORY, 
CoLuMBIA UNIVERSITY. 
Explanation of plate 
The drawings were made with the aid of the Abbé camera lucida. A 
Zeiss microscope was used with a 1/12” oil immersion objective and a number 
3 ocular. The magnification in figures 1, 2, 5, 6, 7, 8 is about 1,200 diameters. 
Figures 3 and 4 were drawn with the Zeiss objective D and number 3 ocular. 
