Contr. Nat. Herb., Vol. IX. 



Plate XI. 



Fig. 1 .— Raphides, or Needle-like Crystals of Oxalate of 

 Lime in Leaf-blade of Taro Plant (Caladium colocasia). 

 Enlarged 100 Diameters. 



Fig. 2.— A Single Capsule Discharging its Needles. Enlarged 

 200 Diameters. 



