PLATE 3. 



jfB 



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



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

 leaf (see fig. 8 1 . The inoculations were made on the blade of the leaf by means of delicate needle-pricks. The material was collected and fixed m 

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



