PLATE 1 
A. —-Typical brown-spotted, yellow oranges borne by a limb variation in the 
tree of the Thomson strain of the Washington Navel orange variety. Victoria 
ranch, Riverside, Calif. Photographed January 8, 1923. Negative 2160. 
B. —Typical Thomson oranges borne by the normal limbs of the Thomson 
Navel orange tree. Victoria ranch, Riverside, Calif. Photographed January 8, 
1923. Negative 2159. 
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