PLATE 42 
1, 2.—Cross sections of an intemode of Ricinus communis , injected on July 22,1916, 
(when young), with distilled water containing 5 per cent of dibasic ammonium phos¬ 
phate. Much thickening of the pith, the inner pathological part of which has tom 
loose from the outer normal part. The cells in the region of the rupture were dead, but 
the remaining tissue of the separated pith cylinder, both the inner light ring of granu¬ 
lations and the middle dark ring, were fully alive. Photographed on August 3, 1916, 
X8. 
