

1 LOW DISEASE OF HYACINTHS. 



(1) Cross-section of bulb, showing in center. Haarlem, 1906. (2) Check-lube of litmus milk. 



(3) / 10 days in li 1) 2 days in litmus milk at J 



(5) Plant 79, variety blue Baron van Tuyll, ii -mugh the flowers. Painted after 17 days. (6) Cross-section of infected 



bulb-scale. The cells of the parenchyma contain starch grains, but only a few are indicated. The xylem and adjacent parenchyma 

 are disorganized ; the phloem is uninjured. After Wakker. (7) Cross-section of a bulb, showing secondary infection. The center 

 ided by a soft while rol and by mites. Haarlem, August, 1906. (8) Outer face of a badly diseased scale. (9) Inner (ace of 

 badly diseased bulb-scale. (10) Inner face of badly diseased bulb-scale, (II) Vertical section of a bulb, showing a secondary 

 infection; the base is occupied by fruiting hyphae of a Penicillium. All from Haarlem, 1906. 



