STEWART'S DISEASE OF SWEET CORN (MAIZE). 



119 



Fig. 49.f 



Fig 504 



*Flo. 48. Section of periphery of a sweet-corn cob, showing Bacterium slewarti filling the vascular bundles and 

 forming closed cavities in base of kernel. For orientation see fig. 47. Drawn under Abbe camera. Slide 135 B 14. 



fFlc. 49. Cross-section of husk of sweet corn occupied by Bacterium stewarti. Bacteria oozing to the surface on 

 many parts of the husk. From a pure-culture inoculation made in August on the leaves in the seedling stage (Potomac 

 Flats experiment). Material collected and fixed in alcohol Oct. 21, 1902. Stained with carbol-fuchsin. Drawn with 

 Zeiss 8 mm. apochromatic objective. No. 12 compensating ocular and Abbe camera. Slide 477 A 2, lower row. The 

 stoma shown in fig. 50 lies on the next section at X. 



JFic. 50. Husk of sweet corn, showing Bacterium slewarti making its way to the surface through a stoma. 

 These bacteria undoubtedly came from the crowded vascular bundle shown in fig. 49. Slide 477 A 2, lower row. 



