PLATE 31 
Ceiling of second (middle) injected intemodeof plant 3 of Ricinus communis , which 
received 1-to-1,200 ammonia water on August 15, 1916. It shows granulations and 
nodules and no killing of the tissues. The dark marginal stripes on the cavity wall 
are normal red stripes due to superposed pigmented pith cells which also occur freely 
in the deeper parts of the normal pith of Ricinus communis. Photographed on Sep¬ 
tember 9. 
