Oct. 4, 1915-Mar. 27, 1916 
Illustrations 
XI 
Plate; XVII. “Jelly-end” rot produced by inoculation with Fusarium radici- 
cola Wollenw.: Fig. 1, 2, 3.—Potato tuber inoculated with F. radicicola 
2890. Fig. 4.—Control potato tuber. 210 
PLATE XVIII. Tuber-rot from Pennsylvania caused by Fusarium eumartii, 
n. sp.: Fig. 1, 2.—External and sectional view of the same potato tuber. 
Fig. 3, 4.—Sectional views of other potato tubers. Fig. 5.—A cross section 
of a potato tuber showing how the fungus frequently follows the tissue adja¬ 
cent to the bundle ring. 210 
Plate XIX. Tuber-rot produced in the laboratory with Fusarium eumartii , n. 
sp., and control potato tuber: Fig. 1, 2.—Control. Fig. 3.—Potato tubers 
showing a soft-rot as a result of rapid development. Fig. 4, 5.—Potato 
tubers selected to illustrate the type of rot in slower development. 210 
Relation of Sulphur Compounds to Plant Nutrition 
Plate XX. Fig. 1.—Clover plants, showing influence of sulphates on growth. 
Fig. 2.—Radish plants, showing influence of sulphates on growth. Fig. 3.— 
Radish plants, showing influence of sulphates on growth. 250 
Plate XXI. Red clover, showing effect of sulphates on growth of roots. 250 
Plate XXII. Fig. 1.—Rape plants, showing influence of sulphates on growth. 
Fig. 2.—Barley plants, showing influence of sulphates on growth. Fig. 3.— 
Oat plants, showing influence of sulphates on growth. 250 
Distribution op the Virus op the Mosaic Disease in Capsules, Fila¬ 
ments, Anthers, and Pistils op Appected Tobacco Plants 
Plate XXIII. Malformed blossoms of tobacco ( Nicotiana tabacum) caused by 
the mosaic disease, which is often responsible for the various abnormalities 
shown.. 256 
Dissemination op Bacterial Wilt op Cucurbits 
Plate XXIV. Fig. 1.—Cucumber field No. 2, with beetle-proof cages in place. 
Fig. 2.—Field No. 1, with one of the cages lifted to show structure of the 
buried part. 260 
Oossypol, the Toxic Substance in Cottonseed Meal 
Plate XXV. Gossypol glands of the cottonseed: Fig. 1.—Lengthwise sections of 
cottonseed kernels, showing glands, folded cotyledons, and hypocotyl. 
Fig. 2.—Cross sections of five widely different varieties of cottonseed ker¬ 
nels: a, Russell Big Boll; 6, Willet's Red Leaf; c, Piedmont Long-Staple; 
d f Allen’s Early; e, Wine Sap. 288 
Plate XXVI. Fig. 1.—Crystals of gossypol “acetate” from alcohol and 50 per 
cent acetic acid. Fig. 2.—Crystals of gossypol from acetone. 288 
Two New Hosts por Peridermium pyriforme 
Plate XXVII. Fig. 1.— Peridermium pyriforme on a trunk of Pinus divaricata, 
showing the form of the peridia before they are ruptured to allow the 
escape of the seciospores. Fig. 2.—A globose gall with Peridermium pyri¬ 
forme on a trunk of Pinus contorta , associated with two lesions of Perider¬ 
mium comptoniae , one near the gall and the other 1 inch above it at the base 
of a branch. Fig. 3.— Peridermium pyriforme on a branch of Pinus ari- 
zonica showing unopened peridia. 290 
