PLATE 3. 



jfB 



Cross-section of petiole of muskmelon No. 150 attacked by Bacillus tracheiphilus . 



The bacteria are confined to the bundles, in each of which cavities have appeared. This section was taken from near the point marked X on the inoculated 

 leaf (see fig. 8). The inoculations were made on the blade of the leaf by means of delicate needle-pricks. The material was collected and fixed in 

 strong alcohol on the 6th day after the appearance of the disease. 



