Smithsonian Report, 1926.—Coville PLATE 9 
ALUMINUM-SULPHATE TREATMENT OF THE BLUEBERRY FOR SEVEN MONTHS 
Both the plants shown in this illustration were small healthy seedlings of the same size on 
February 4, 1924, when they were potted in a fertile but neutral garden soil known to be 
injurious to blueberry plants. The plant at the left was given a heavy application of alumi- 
num sulphate. On September 9, when the two plants were photographed, the beneficial 
effect of the aluminum sulphate was conspicuous. Two-thirds natural size 
