PLATE 24 
1. —Plant 5 of Ricinus communis , branch B, injected August 15,1916, with 1 to 1,200 
ammonia water, showing proliferations from the ceiling and side walls of the second 
intemode above the uppermost injected one. There are half a dozen side-wall tumors, 
as well as the central one. Surface of the pith uninjured. X 5 - 
2. —Section of small marginal proliferation on wall of pith cavity shown in figure r. 
X160. Compare with Plate 29, figure 6. 
3. —Same as figure 1, but from branch C. This is the third intemode above the 
uppermost injected one. There were also proliferations in the first and second 
intemodes above the injected one. Here the proliferations are all on one side in a 
perpendicular line, all are inconspicuous elevations, and the pith surface as a whole 
is entirely normal. Photographed on September n, 1916. X3. 
