PLATE iq 
1. —Floor of upper injected intemode of the mam axis of plant i of Ricinus c<m- 
munis , showing copious proliferations from the pith. This was injected with i to ioo 
ammonia water on August 15. Photographed on October 3, 1916. X4. 
2. —Same as figure i, but with the stem pared down one-fourth inch to remove 
shadows and show the proliferations in their proper color (pure white). Photographed 
on October 3, 1916. X4. 
