AS AIDS IN THE DETERMINATION OF SPECIES. 35 



Cr3^stals. — Few. 



Hard Bast.— Sparingly developed, sometimes consisting of isolated cells. 

 Wood-curve (see Fig. 27). — Usually with slender, elevated horns, dipping inward. 

 Vessels. — Largest, ~ in. 



Average, about ^ in. 



Rather small on the whole, comparatively few, somewhat scattered, 

 and mostly absent from lower portion of wood. 

 Characteristic features : 

 Section. — Small. 



Cortical Cavities. — Numerous, but comparatively small. 

 Hard Bast.— Sparingly developed. 

 Wood-curve. — Usually symmetrical and entire, with slender and very gently 



incurved horns. 

 Vessels. — Comparatively small. 



VI. — Forms Belonging to Victoria, New South Wales, and Queensland. 



IB. E. melliodora, Cunningham ; honey-scented Eucalypt, or yellow box tree. 



Tree. — Middle-sized. 



Leaves. — Equally dull-green on both sides. 



Size of Section. — About J line broad and thick, or as broad as thick. 

 Outline of Section.— Bound or oval, and flattened on upper surface. 

 Epidermis. — Thickness, ^ — 4 ^^• 

 Breadth, about ~ in. 

 Cortical Cavities.— ^ip in., round, numbering from 4 to 1 or none. 

 Crystals. — Very numerous, and frequently in groups. 

 Hard Bast. — Continuous, and generally two cells thick. 

 Wood-curve (see Fig. 28).— Always found unbroken, with thickened body and 



sharply inturned short horns. 

 Vessels. — Largest, ,-4o^- 



Average, about ^^in. 



Medium-sized, numerous, and equally distributed. 

 Characteristic features : 



Section. — Small; as broad as thick. 



Cortical Cavities. — Small and few. 



Hard Bast. Coutmuous, and generally a two-celled layer. 



Wood-curve.— Always found unbroken, with thickened body and shorthorns. 



Vessels. —Medium-sized, numerous, and equally distributed. 



