PLATE ii 
A. —Effect of aluminum nitrate upon the vascular plate tissue in an injected stalk. 
An equivalent of 9 mgm. of aluminum caused this injury. The first effect was a 
browning of the tissues, which was followed by complete disintegration. 
B. —Tne leaf showed first a slight yellowing of the intervascular tissues, giving the 
appearance of yellow streaks, then a water-soaked appearance, and finally necrosis. 
The last effect is shown here. 
