Jan. 2-Mar. 26, 1917 
Illustrations 
VII 
Page 
Plate 30. Ceiling of tipper treated intemode of plant 2 of Ricinus 'communis, 
which was injected with 1 to 1,200 ammonia water. 188 
Plate 31. Ceiling of second (middle) injected intemode of plant 3 of Ricinus 
communis , which received 1 to 1,200 ammonia water. 188 
Plate 32. 1, 2.—Stem of Ricinus communis exposed to the vapors of monobasic 
ammonium phosphate (20 per cent in water). 188 
Plate 33. Stem of Ricinus communis in cross section showing pith-lining of 
normal node. 188 
Plate 34. Longitudinal section of stem of Ricinus communis showing further 
effects of vapor of monobasic ammonium phosphate.... 188 
PLATE 35. Longitudinal section through a normal node and part of the two 
adjoining internodes of a well-developed plant of Ricinus communis . 188 
PLATE 36. Top of an unopened intemode in a stem of Ricinus communis next 
under one that had sealed into it a tube containing 0.2 c. c. of a 20 per 
cent solution of monobasic ammonium phosphate. 188 
PLATE 37. 1.—Longitudinal section of a normal young intemode of Ricinus com¬ 
munis. 2.—Cross section of a Ricinus intemode into which was injected 
a 5 per cent solution of monobasic ammonium phosphate. 3.—Injected 
intemode of another plant in the same series. 4.—Cross section of a normal 
intemode of the same age as that in figure 2. 188 
Plate 38. 1.—Same as Plate 37, figure 2, but from an embedded stained section. 
2. —A detail of the second xylem-phloem ring showing irregularities more 
distinctly. 3.—Sieve plate from second xylem-phloem ring. 4.—Dis¬ 
torted sieve tube from third xylem-phloem ring. 188 
Plate 39. 1.—Enlarged cross section of a rather regular portion of the second 
xylem-phloem ring in Ricimis communis (PI. 37, fig. 2). 2.—From the 
same vascular ring, as figure 1, showing trachese lying at right angles to the 
longer axis of the stem. .... 188 
Plate 40. 1.—Cross section of second xylem-phloem cylinder in Plate 37, 
figure 2, 2.—Another swirl of cambium on the pith-cavity side of the 
second xylem-phloem ring in Ricinus communis . 188 
Plate 41. 1.—Second xylem-phloem ring in Plate 37, figure 2. 2.—A por¬ 
tion of the fourth (imperfect) xylem-phloem ring in Plate 37, figure 2. 
3. —Like figure 2, but another part of the fourth xylem-phloem cylinder.. 188 
Plate 42. 1, 2.—Cross sections of an intemode of Ricinus communis , injected 
with distilled water containing 5 per cent of dibasic ammonium phos¬ 
phate . 188 
Plate 43. 1.—General view of the small displaced vascular strands shown at 
X in Plate 20. 2.—Structure in cross section of the larger of the two 
strands in figure 1. 3.—Sieve plates of figure 2 further enlarged. 188 
Plate 44. 1.—Cross section of stem of Ricinus communis treated with ammo¬ 
nia. 2.—Cross section of Recinus stem treated with strong ammonia. 188 
Plate 45. 1.—Inner three-quarters of one of the middle proliferations on Plate 
5. 2.—Recinus stem treated with strong ammonia. 188 
Plate 46. 1,2.—Cross sections of the killed tissue (pith) at one side of the pro¬ 
liferations shown on Plate 5. 3.—Cross section of cauliflower leaf, show¬ 
ing intumescences formed after exposure to vapor liberated from one- 
half gm. of secondary methylamin chloride. 188 
Plate 47. 1.—Vertical section of outer part of the proliferations just below the 
surface shown on Plate 5. 2.—Vertical section in same region as figure 1, 
but at another level. 188 
Plate 48. Portion of under surface of a cauliflower leaf showing intumescences 
due to vapor of ammonia. 188 
