Oct. 4, i9is-Mar. 37, 1916 lUustratiofis XI 



Page 

 Plate XVII. "Jelly-end" rot produced by inoculation with Fusarium radici- 



coZa WoUenw. : Fig. i, 2, 3. — Potato tuber inoculated with F. radicicola 



2890. Fig. 4. — Control potato tuber 210 



Plate XVIII. Tuber-rot from Pennsylvania caused by Fusarium eurnartii, 

 n. sp.: Fig. i, 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. i, 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. i. — Clover plants, showing influence of sulphates on growth. 

 Fig. 2. — Radishplants, 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. i. — Rape plants, showing influence of sulphates on growth. 

 Fig. 2. — Barleyplants, showing influence of sulphates on growth. Fig. 3. — 

 Oat plants, showing influence of sulphates on growth 250 



Distribution op the Virus of the Mosaic Disease in Capsules, Fila- 

 ments, Anthers, and Pistils op Affected 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 of Bacterial Wilt of Cucurbits 



Plate XXIV. Fig. i. — Cucumber field No. 2, with beetle-proof cages in place. 

 Fig. 2. — Field No. i, with one of the cages lifted to show structure of the 

 buried part 260 



GossYPOL, the Toxic Substance in Cottonseed Meal 



Plate XXV. Crossypol glands of the cottonseed: Fig. i. — 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; b, Willet's Red Leaf; c. Piedmont Long-Staple; 



d, Allen's Early; e, Wine Sap 288 



Plate XXVI. Fig. i. — Crystals of gossypol "acetate" from alcohol and 50 per 



cent acetic acid. Fig. 2 . — Crystals of gossypol from acetone 288 



Two New Hosts for Peridermium pyriforme 



Plate XXVII. Fig. i. — 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 i inch above it at the base 

 of a branch. Fig. 3. — Peridermium pyriforme on a branch of Pinus ari- 

 zonica showing unopened peridia 290 



