PLATE 13 
Intemode of Ricinus communis showing a pith cavity occupied by numerous anas¬ 
tomosing, white glistening strands and small nodules lying loosely connected on the 
surface, and due to injection on August 12,1916, of a 5 per cent solution of ammonium 
bicarbonate. This is an unopened intemode—the second intemode above the upper¬ 
most injected one. Portions of the injected intemodes were killed. For the normal 
appearance of such an intemode see Plate 37, figure 1, and branches of Plate 14, figure 1. 
Photographed on August 25. X 5. 
67908°—17- 1 
