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