Oct. i-Dec. 31, 1917 
Illustrations 
IX 
Page 
Plate 47. A.—Barley leafblight, showing exudate gathered in three grayish 
glistening drops on the surface of the water-soaked blighting area. B.— 
Blighting barley leaf. Early stage of mid-leaf stripe invasion, this stripe 
showing the water-soaked translucent appearance, the grayish exudate 
so abundant as to have formed a glistening droplet just above the ligule. 
C.—Blighting barley leaves, natural infection, a, A small insect (midge) 
entrapped in the exudate, b , The dry, thin grayish exudite film (X) at the 
lower part of the blighted area is partly detached and tinned back. The 
exudate film is so nearly transparent that the leaf veins are slightly visible 
through it. D.—Barley leaf, showing general blighting, the surface stud¬ 
ded with numerous exudate droplets hardened into yellowish resinous 
granules, readily dislodged. 644 
Plate 48. A—Photomicrograph of a bead of hardened exudate dissolving in 
water under microscope. B.—Five-day-old agar slant cultures of Bact . 
translucens incubated at 24° C. C.—Colonies of Bact. translucens on pep¬ 
tone-beef agar plate, dilution culture from bouillon. 644 
Plate 49. A.—Blighting barley culms at heading stage. B.—Barley seed¬ 
lings showing abundant infections on first leaves three days after atomizer 
inoculation with strain of organism isolated from 2-year-old seed. 644 
Structure op the Pod and the Seed op the Georgia Velvet Bean, 
Stizolobium deeringianum 
Plate 50. A.—Thin-walled parenchyma forming the satin tissue that lines 
the pod. B.—Cross section of a vascular bundle of the pod. C.—Section 
of epidermis of pod, showing a stoma and several of the basal cells from 
which the hairs arise. D.—Fiber cells. E. —Fiber cell in longitudinal 
section. F.—Fiber cells in cross section. G.—Cross section of velvet- 
bean pod, showing both conditions of surface hairs arising from the epider¬ 
mal layer. H.—Sclerenchyma cells. I.—Sclerenchyma cells. J.— 
Sclerenchyma cells in cross section. 676 
Plate 51. A.—Georgia velvet bean. B.—Cross section through hilum, show¬ 
ing thick-walled parenchyma of the caruncle and the very short palisade 
cells of the hilar tissues. C.—Palisade cells of seed coat, top view. D.— 
Palisade cells of seed coat. E. —Cross section through seed coat elsewhere 
than at the hilum, showing relationship of palisade cells, hour-glass cells, 
and the underlying parenchyma. F.—Hour-glass cells seen from above. 
G.—Hour-glass cells, side view. H.—Spirals from vascular bundles of the 
seed coat. I.—Cross section of cotyledon, showing outer epidermis, and 
smaller cells filled with starch grains and proteid granules. J.—Cross section 
of cotyledons, showing the medial line of the two cotyledons with inner 
epidermis and adjoining much larger cells with starch grains and proteid 
granules correspondingly larger.... 676 
Eupatorium urticaepolium as a Poisonous Plant 
PLATE 52. Eupatorium urticaef olium, white snakeroot. 716 
Plate 53. Poisoning by Eupatorium urticaefolium: A., —Sheep 309, showing 
weakness. B.—Sheep 309, showing trembling. 716 
Plate 54. Poisoning by Eupatorium urticaef olium: A. —Sheep 367 at 11.17 
a. m. on September 30. B.—Sheep 367 at 11.20 a. m. on September 30.. 716 
Plate 55. Poisoning by Eupatorium urticaef olium: A. —Sheep 368 on Sep¬ 
tember 24. B.—Sheep 368 a little later the same day. 716 
23720 °— 18 - 2 
