PLATE 12 
i, 2.—Intemodes of Ricinus communis injected August 12, 1916, with a 5 per cent 
water solution of sodium bicarbonate. Cavity filled with copious wound prolifera¬ 
tions, all of which are from the pith. The light-colored longitudinal band on either 
side of the pith cavity shows the extent of the thickening. Killing effects as fissures 
are visible here and there in figure 1, especially in the inner (sectioned) part of the 
pith on the right side and more abundantly in figure 2 as caps on the nodules. 
Photographed on August 25. X5. 
