PLATE V. 



F:(U'RE 1 — Transverse section of cladode of Opunlid incrmis, D.C, showing 

 from the outer layer inwards — 



I. The epidermis of one layer of cells. 



FI. Single layer containing crystals of oxalate of lime. 



I [I. Derinij or collenchyma of five layers of cells. 



IV. Palisade ]3arenchyraa. 



v. On the right centre a stomatal tube. 



VI. Relow it a mass of crystal sand. 



Figure 2 — Epidermis of ('rreusgramliflorus. Haw., showing seven stomata. 



