PLATE 15 
A.—Relation of location of seed-coat injury to attack by Penicillium on wheat 
germinating in infected soil: 1, hand-thrashed, seed coats uninjured; 2, hand-thrashed, 
seed coats broken over the embryo; 3, hand-thrashed, seed coats broken over the 
endosperm. 
B-—Relation of location of seed-coat injury to infection of wheat by Penicillium in 
the soil: 1, soil infested, seed coats broken over endosperm; 2, control, soil not infested, 
seed coats unbroken; 3, soil infested, seed coats broken over embryo; 4, soil infested, 
seed coats unbroken. 
