PLATE 19 
YELLOW DISEASE OF HYACINTHS. 
’ (1) 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 alter 36 days. (4) Hyacmth scape, plant 20, inoculated at 
x. Painted after 27 days. (5) Cross-section diseased hyacinth bulb, Haarlem, August, 1906. (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 
