Jan. 2-Mar, *6, 1917 
Illustrations 
XI 
Page 
tents are a dense mixture of granular protoplasm and small oil droplets. 
C.—Lateral view of a young zygospore in the same stage of development as 
figure B. D.—Coenocytic mycelium. E. —Mature zygospore with a 
well-developed exospore and a large oil globule. 328 
Pi, ATE 87. Choanephora cucurbitarum: A.—Fructifications on squash corollas 
and flower pedicels. B.—Natural infection on squash fruit showing the 
rapidity of the decay when contrasted with figure C, which is reproduced 
from a photograph of the same fruit 15 hours earlier. C.—A diseased 
teratological squash. D.—Infection through the corolla in the fruit at the 
left and complete decay of the squash at the right. 328 
Discovery of Internal Telia Produced by a Species of Cronartium 
Plate 88. A.—Cross section of a petiole of Ribes roezli, showing the pericycle 
(a) and pith ( b ) regions which are stuffed with the mycelium of Cronartium 
ribico la. B.—Longitudinal section of the same petiole, showing the manner 
in which the sori force aside the parenchyma cells of the pith. C.—Internal 
telium of Cronartium ribico la from the pericycle region of a petiole of 
Ribes roezli. D.—Internal telium of Cronartium ribicola from the pericycle 
region of a petiole of Ribes roezli flattened by pressure. E. —Young 
internal telium of Cronartium ribicola from the center of the pith region 
of a petiole of Ribes roezli , illustrating the depth at which sori may start to 
develop. 332 
Little-Leaf of the Vine 
Plate 89. A.—A grapevine showing a severe infection of little-leaf. B.— 
A moderately affected grapevine, showing healthy first leaves. 398 
Plate 90. A.—Tyloses in the wood of the grapevine. B.—Grapevine shoots 
showing little leaves and laterals. 398 
Plate 91 A, B.—Drawings of tyloses in the wood of the grapevine. C, D, E.— 
Cross section of the trunks of the grapevine. F, G.—Cross sections of 
healthy and diseased pediocels of the grapevine. 398 
Plate 92. A.—Grapevines showing the effect of treatment with an injection of 
copper sulphate. B.—Vineyard showing a severe case of the intensive 
form of little-leaf. 398 
Spore-Forming Bacteria of the Apiary 
Plate 93. A.— Bacillus mesentericus: Growth of a 24-hour-old surface colony on 
an agar plate. B.— Bacillus vulgatus: Growth of a 24-hour-old surface 
colony on an agar plate. 420 
Plate 94. Growth of 24-hour-old cultures on potato slopes: A.— Bacillus 
vulgatus. B.— Bacillus mesentericus . C.— Bacillus alvei . D.— Bacillus 
orpheus . 420 
Fusarium-Blight, or Wilt Disease, of the Soybean 
Plate 95. A.—A diseased stem of soybean, showing the roughened appearance 
caused by the irregular covering of sporodochia. B.—Interior of healthy 
stem of soybean. C.—Interior of diseased stem of soybean. D.—Soybean 
plants grown out of doors in the same type of clay soil: £>, healthy; 
E, diseased through the naturally infected soil. 440 
Peanut Wilt Caused by Sclerotium Rolfsii 
Plate 96. A.—A hill of peanut plants completely wilted by Sclerotium Rolfsii . 
B.—A portion of a wilted shoot showing the white mycelium and sclerotia of 
Sclerotium Rolfsii about its base. 448 
