E, BRAITHWAITE ON THJE HISTOLOGY OF PLANTS. 217 



11. — Albumen cells of Ivory nut, with pore canals. P. X 370. 



12. — Bordered open pores of wood of Pinus silvestris. A. in sec- 

 tion ; B. seen on the surface ; P. pore canal ; B. border ; 

 i. intercellular substance. X 660. 



13. — Cell from a transverse section of a leaf of Pinus silvestris^ 

 with knob-like thickening of the cellulose case, x 370. 



14. — Thickened epidermis cells from petal of Pelargonium. A, 

 seen from above ; P. in vertical section. X 370, 



