46 



PhotoDiicrdgrapJis of Bntmnciil Studies. 



70.~T.S. Leaf of " Metrosideros verni," Bottle-brush Shrub. 





Palisade layer 



Primary vascular bundle. 



Stoma. 



Secondary vascular bundle. 



Oil glanL 



71.— Entire Sting of " Urtica dioica," Common Nettle. 



Capitate Apex of sting 



Cavity of sting filled with 



irritant fluid 

 Enlarged base of sting 



Midrib of leaf 



Stiff hairs on midrib of 

 leaf 



