ILLUSTRATIONS 
PLATES 
Temperature Relations op Apple-Rot Fungi 
Plate I. A.—Grimes Golden apple affected with blackrot, showing character 
of the natural infections with Sphaeropsis malorum that were used in the 
temperature experiments. B.—Ben Davis apple affected with bitter-rot, 
showing the character of the natural infections with Glomerella cingulata that 
were used in the temperature experiments. 
PLATE 2. Yellow Newtown apples, showing the behavior of Sclerotinia cinerea 
at different temperatures: A.—Results obtained with a culture of S. cinerea 
from a peach after two weeks at o°, 5°, io°, 15 0 , 20°, 25 0 , 30° C. B.—Re¬ 
sults obtained with a culture of S. cinerea from an apple after one week 
at o°, 5 0 , io°, 15 0 , 20 0 , 25 0 , 30° C. C.-“—Results obtained with a culture of 
Sphaeropsis malorum after two weeks at o°, 5 0 , io°, 15 0 , 20°, 25 0 , 30° C. 
D.—Results obtained with a culture of Penicillium expansum after two 
weeks at o°, 5 0 , io°, 15 0 , 20°, 25 0 , 30° C . 
Plate 3. Yellow Newtown apples, showing the behavior of apple-rot organ¬ 
isms at different temperatures: A.—Results obtained with a culture of Vol¬ 
ute lla fructi after two weeks at o°, 5 0 , io°, 15 0 , 20°, 25 0 , 30° C. B. — Re¬ 
sults obtained with a culture of Glomerella cingulata after two weeks at 
o°, 5 0 , io°, 15 0 , 20 0 , 25 0 , 30° C. C.—Results obtained with a culture of 
Neofabraea malicorticis after three weeks at o°, 5 0 , io°, 15 0 , 20°, 25 0 , 30° C. 
D.—Results obtained with a culture of Neofabraea malicorticis after five 
weeks at o°, 5 0 , io°, 15 0 C . 
Mechanism op Tumor Growth in Crowngall 
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164 
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164 
Plate 4. Pith cavity of a stem of Ricinus communis showing proliferations of 
deep origin due to the injection of a mixture of strong ammonia and water.. 188 
Plate 5. Opposite side of the pith cavity of Ricinus communis shown in Plate 4. . 188 
Plate 6. I, 2.—Sections of a green tomato fruit showing carpellary surface 
proliferations due to ammonium carbonate. 3.—Inner face of carpel of a 
green tomato fruit showing numerous mulberry-like white surface pro¬ 
liferations due to the injection of ammonium acetate. 188 
Plate 7. 1, 2.—Inner face of carpel wall of green tomato fruit showing pro¬ 
liferations due to ammonium tartrate. 188 
Plate 8. 1.—From the same series of sections as the figures on Plate 7, but 
showing a more copious proliferation of cells. 2.—Normal tissue of inner 
face of tomato carpel in vicinity of figure 1. 3.—Lining membrane of 
figure 2, passing into such a tumor as figure 1. 188 
Plate 9. I, 2.—Same slide as Plate 7, but showing greater variations in the 
size of the proliferated cells.. 188 
Plate 10. Longitudinal section of a stem of Ricinus communis injected with 
distilled water containing 10 per cent malic acid. 188 
Plate ii. I. —Middle of an internode of Ricinus communis injected with 10 per 
cent malic acid, showing copious surface pith proliferations. 2.—Mid¬ 
dle of a Ricinus intemode injected July 18 with 10 per cent uric acid. 
3.—Middle of a Ricinus intemode, showing copious tumor-like prolifera¬ 
tions due to the injection of a 20 per cent solution of urea. 4.—Two 
Ricinus intemodes injected with a 10 per cent solution of tannic acid.... 
(v) 
188 
