EXPERIMENT STATION BULLETINS. 



437 



Fig. 11. Longitudinal section of phloom tissue in tomato plant atTected with mosaic. A trypanosoine 

 is seen in a sieve tube. X 1*00. 



A. Try pane: ome. 



B. Cell nucleus. 



C. Sieve tube. 



Fig. 12. Photomicrograph of a broad type of organism in a sieve type of a mosaic tomato plant 

 X 650. 



A. Trypanosome-like organism. 



B. Sieve tube. 



V 



