PLATE 32 
1, 2.—Stem of Ricinus communis exposed to the vapors of monobasic ammonium 
phosphate (20 per cent in water). Figure 1 is a front view and figure 2 a side view 
of nodular growths which developed on the ceiling of the unopened intemode next 
below the one into which was sealed a sterile glass tube containing 0.2 c. c. of the 
fluid. Experiment begun August 21, 1916. Photographed on September 2. X 5 - 
