VI Journal of Agricultural Research voi. xv 



Page 



Plate 9. A. — Distribution of the intumescences on cabbage leaves. B. — 



Intumescences on cabbage leaves photographed by transmitted light. ... 112 



Plate 10. A. — Section of cabbage tumor after seven days, showing the chains 

 of cells beginning at the epidermis and areas of small cells in active division 

 in the center of the leaf. B. — Section of cabbage tumor after two weeks' 

 growth 112 



Plate h. A. — Cabbage plants showing the relative injury to hardened (H) 

 and nonhardened (NH) plants after exposure for the time given on the 

 label in minutes to a temperature of —3° C. B. — Tomato plants showing the 

 relative injury to plants from the greenhouse (NH) and from coldframes 

 (H) after exposure for the time given on the labels in minutes to —1.5° C 

 The plants from the coldframes were not frozen 112 



The Meadow Plant Bug, Miris dolabratus 



Plate 12. Miris dolabratus: A. — a, Eggs in grass stem, all hanging in one direc- 

 tion; b, eggs in grass stem placed in opposite directions; c, same as upper 

 part of b, more enlarged; d and e, eggs in clover stems. B. — Eggs at left; i, 

 first instar; 2, second instar; j, third instar; j+, thirdinstar more mattire; 

 4, fourth instar; 5, fifth instar; 6, adult male above, female below 200 



Anglxar-Leafspot of Cucumber: Dissemination, Overwintering, and 



Control 



Plate 13. A. — Cucumber leaf five days after inoculation with Bacterium lach- 

 rymans, showing severe infection. B. — Plant a, photographed seven days 

 after inoculation with Bad. lachrymans, shows considerable stunting as com- 

 pared with the uninoculated control, plant b 220 



Plate 14. Stomatal movement in relation to infection 220 



Plate 15. A. — Overwintering on seed: Nattiral infections on cotyledons of 

 seedling grown in steamed sand from commercial seed which had been kept 

 in storage for seven months after harvesting. B. — Picker dissemination. 

 C. — Dissemination by rain 220 



Plate 16. A. — Seedling infection resulting from seed inoculation with Bac- 

 terium lachrymans. B. — Cucumber fruit showing small, watersoaked, 

 circular spots with white centers resulting from natural infections with 

 angular-leafspot 220 



Plasticity of Biologic Forms of Puccinia graminis 



Plate 17. A, B. — Puccinia graminis tritici from Hordeum jubaium (Moorhead, 

 Minn.) on rye after having previously spent 2 urediniospore generations 

 on rye, 4 on barley, i on rye, 2 on wheat, and 5 more on barley. C. — 

 Puccinia graminis tritici from Hordeum jubatum, originally from Moorhead, 

 Minn., but with subsequent history of R2 — B4 — Ri — W^ — B5 — Rj 250 



Plate 18. A. — Puccinia graminis tritici from Hordeum jubaium, originally from 

 Moorhead, Minn., but with subsequent history of Rj — B4 — Rj — Wg — B5 — 

 Rj: vSmall uredinia and sharp flecks on rye. B, C. — Puccinia graminis 

 tritici on wheat 250 



Fumigation of Cattle ya Orchids with Hydrocyanic-Acid Gas 



Plate 19. Cattleya schroederae five months after having been fumigated with 



hydrocyanic-acid gas at the rate of i ounce per 100 cubic feet of space 268 



Plate 20. Examining a case of cattleyas before fumigation at the port of New 



York 269 



