PLATE 25 
Upper half of first intemode above the upper injected one in the main axis of 
plant 5 of Ricinus communis , which was injected August 15, 1916, with 1 to 1,200 . 
ammonia water. The wall is thickened and there are numerous small prolifera¬ 
tions—stringy growths and nodules. The surface pith between is normal, but the 
deeper layers of the pith are white (occupied by air). Photographed on Sep¬ 
tember 11. X5. 
