VI 
Journal of Agricultural Research 
Vol. VIII 
Page 
Pirate 12. 1, 2.—Intemodes of Ricinus communis injected with a 5 per cent 
solution of sodium bicarbonate. 188 
Pirate 13. Intemode of Ricinus communis showing a pith cavity occupied by 
numerous strands and small nodules due to injection on August 12, 1916, 
of a 5 per cent solution of ammonium bicarbonate. 188 
Plate 14. i.—Longitudinal section of a stem of Ricinus communis , showing 
copious proliferations due to a 5 per cent grape-sugar solution. 2,—Cross 
section below figure 1. 3.—Cross section of a Ricinus intemode which 
received 0.2 c. c. of clear lime water when young. 188 
Plate 15. 1, 2.—Intemodes of Ricinus communis, showing the result of inject¬ 
ing a 5 per cent solution of cane sugar into young intemodes of the main 
axis. 3.—Cross section of upper part of a young Ricinus stem showing 
pith cavity lined by a thin sheet of cell proliferations due to the injection 
of ammonium tartrate. 4.—Side view of figure 3, further enlarged. 188 
Plate 16. 1.—Eight small tumors and various strands in an unopened internode 
of Ricinus communis . 2.—Section of one of the tumors shown in figure 1.. 188 
Plate 17. 1, 2.—Cross sections of two intemodes of Ricinus communis (two 
plants), showing pith proliferations due to the vapors from monobasic am¬ 
monium phosphate. 188 
Plate 18. 1.—Top of lower injected intemode of plant 1 of Ricinus communis , 
which received 1 to 100 ammonia water. 2.—Section 1 inch below figure 1, 
but above the needle entrance. 188 
Plate 19. 1-—Floor of upper injected intemode of the main axis of plant 1 of 
Ricinus communis, showing copious proliferations from the pith. 2.—Same 
as figure 1, but with the stem pared down one-fourth inch. 188 
Plate 20. 1.—Plant 1 of Ricimis communis , which received 1 to 100 ammonia 
water. 2.—Side view of the same. 188 
Plate 21. 1.—Roof of second unopened intemode below lowest injected one 
on main axis of plant 1 of Ricinus communis , which was injected with 1 to 
100 ammonia water. 2.—Free-hand unstained section of tumor shown in 
figure 1. 188 
Plate 22. I, 2.—Plant 5 of Ricinus communis , injected with 1 to 1,200 am¬ 
monia water. 188 
Plate 23. Plant 5 of Ricinus communis, branch A, showing effect of 1 to 1,200 
ammonia water. 188 
Plate 24. 1.—Plant 5 of Ricinus communis, branch B, injected with 1 to 1,200 
ammonia water. 2.—Section of small marginal proliferation on wall of pith 
cavity shown in figure 1. 3.—Same as figure 1, but from branch C. 188 
Plate 25.—Upper half of first intemode above the upper injected one in the 
main axis of plant 5 of Ricinus communis, which was injected with 1 to 
1,200 ammonia water. 188 
Plate 26. Lower half of same intemode as Plate 25, showing continuation of 
tumors and strands. 188 
Plate 27. 1.—Cross section of a normal internode of the same age as figure 2. 
2.—Main axis of plant 5 of Ricinus communis, injected with 1 to 1,200 am¬ 
monia water. 3.—Main axis of Ricinus plant 5, injected with 1 to 1,200 
ammonia water. 188 
Plate 28. 1, 2, 3, 4.—Plant 4 of Ricinus communis, injected with 1 to 1,200 
ammonia water. Figure 3 is a ceiling. 188 
Plate 29. 1-5.—Petiole and stem sections of plant 4 of Ricinus communis, 
which was injected with 1 to 1,200 ammonia water. 1.—Middle of petiole. 
2, 3, 4, 5.—Parts of four unopened internodes at the top of the plant. 
6.—Normal pith from Plate 24, figure 1. 188 
