ILLUSTRATIONS 
PLATE 1 
Fig. 1. Fruits of the Valencia orange; above, inoculated with Pseudomonas 
citri and twenty needle punctures giving 100 per cent positive 
results; below, fruits more nearly mature, inoculated by the same 
methods and the same culture, giving entirely negative results, 
2. Fruits of the Washington navel orange inoculated with Pseudomo- 
nas citri when 44 days old, showing numerous stomatal infec- 
tions and the stunted size of the fruits. 
PLATE 2 
Fig. 1. A fruit of the Washington navel orange inoculated with Pseudo- 
monas citri when 55 days old, showing stomatal infections as 
well as 100 per cent infection at needle punctures. 
2. A fruit of the Washington navel orange inoculated with Pseudo- 
monas citri when 86 days old, showing no stomatal infections but 
100 per cent infection at needle punctures. 
PLATE 3 
Fruits of the Washington navel orange, each inoculated with Pseudomonas 
citri and twenty needle punctures when 130 days old, showing 
the entirely negative results. 
PLATE 4 
Fruits of the Ikiriki Unshiu (Satsuma) orange inoculated without needle 
punctures when 40 days old, showing the numerous stomatal 
infections and their atypical character. 
TEXT FIGURE 
Fic. 1, Graphs showing the differences in lengths of periods of suscep- 
tibility of three commercial citrus varieties, 
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