GOLDSTEIN: PLANTS AFFECTED WiTH Mosaic DISEASE 267 
I have diagrammed with the aid of a camera lucida the 
changes of form which one of these X bodies showed in the course 
of one and one-half hours. The stages are numbered from 1 to 
34 and are shown in text figure 1. In several stages a clear hya- 
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Be i 
Fic.2. Diagram ofa cell froma branching trichome showing the geaeral 
direction of the path followed by the se changes in form are 
shown in text figure 1. The movement of the ed for the same period is 
also shown in the dotted line. 
