PLANT BACTERIA, VOL. 2. 



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PLATE 19 



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YELLOW DISEASE OF HYACINTHS. 



(I) Hyacinth leaf, plant 53, inoculated at x. Painted after 23 days. (2) Hyacinth leaf, plant 49. inoculated at x. Painted 

 after 23 days. (3) Hyacinth leaf, plant 28, inoculated at x. Painted after 36 days. (4) Hyacinth scape, plant 20, inoculated at 

 x. Painted after 27 days. (5) Cross-section diseased hyacinth bulb, Haarlem, August, 1 906. (6) Longitudinal section through 

 bulb in same stage of disease as 5. Plateau badly diseased, cavities present and lower surface ruptured. (7) Like 6, but the base of 

 the plateau not yet ruptured. (8) Bulb some hours after cross-section, showing bacterial ooze from diseased bundles. (9) Cross-section 

 of bulb, showing scales very gummy on one side. For appearance of individual scales in this stage of disease see plate 20. All from 

 Haarlem. Leaves by F. A. Walpole ; bulbs by Henrietta Schilthuis. 



