PLATE 20 
i—plant i of Ricinus communis, which received i to ioo ammonia water. Cross 
section of first (untreated) intemode above the one figured on Plate 19, showing on 
one side an excess of pith, in the middle of which are displaced vascular bundles. 
There are no surface granulations. X5. 
2.—Side view of the same. The ridge extended the whole length of the 6-inch 
internode, through the floor of which there was an abnormal opening into the treated 
intemode below. Vascular strands at X. Injected August 15, 1916. Photographed 
on October 3. X5. For the structure of the strands see Plate 43. 
