Naturalisation in Extra-Tropical Countries. 189 



Eucalyptus crebra, F. v. Mueller.* 



The narrow -leaved Ironbark-tree of New South Wales and 

 Queensland. Wood reddish, hard, heavy, elastic and durable ; 

 much used in the construction of bridges and for railway-sleepers, 

 also for waggons, piles, fence-posts. The best species in sub-tropic 

 East-Australia for splitting into palings, such in fences have 

 remained sound after 30 years [J. Edgar]. The oil, which has 

 become a commercial article, is rich in Eucalyptol [Schimmel]. E. 

 drepanophylla is a closely allied species of similar value, bearing an 

 enormous strain. Both exude astringent gum-resin, resembling kino 

 in appearance and property, to a considerable extent. They are 

 susceptible to frost. 



Eucalyptus diversicolor, F. v. Mueller.* (E. colossea, F. v. M.) 



The Karri of South- Western Australia. A colossal tree, excep- 

 tionally reaching the height of 400 feet, with a proportionate girth 

 of the stem. Mr. Muir measured stems nearly 300 feet long with- 

 out a branch ; widths of the timber as much as 12 feet can be 

 obtained. Furnishes good timber for building, even for masts,' 

 likewise for planks ; also valuable for shafts, spokes, felloes, fence- 

 rails ; it is elastic, but not so easily wrought as that of E. 

 marginata. Mr. G. Simson does not deem the wood very durable, 

 if exposed to moisture or if in contact with the ground. Its strength 

 in transverse strain is equal to English oak, while it is 50 per cent, 

 stronger in regard to vertical crushing strain, according to tests made 

 under the supervision of Mr. Laslett. Admirable for wood bricks 

 even in cold climes. It is not so liable to warp as that of many other 

 species. Very fair progress of growth is shown by the trees 

 planted even in dry exposed localities in Melbourne. The shady 

 foliage and quick growth of the tree promise to render it one of our 

 best for avenues. In its native localities it occupies fertile, rather 

 humid valleys and resembles there in habit the E. amygdalina var. 

 regnans of South-Eastern Australia. Proved well adapted for the 

 mountains of Ceylon, and Professor Bourlier mentions it as one of 

 the best at Algiers. 



Eucalyptus Doratoxylon, F. v. Mueller. 



The Spearwood-tree of South-Western Australia, where it occurs 

 in sterile districts. The stem is slender and remarkably straight, 

 and the wood of such firmness and elasticity that the nomadic 

 natives wander long distances to obtain it as a material for their 

 spears. It is not a large tree. 



Eucalyptus eugenic-ides, Sieber. 



The White Striugybark-tree of Victoria and New South Wales. 

 The tree is abundant in some localities, and attains considerable 

 dimensions. Its useful fissile wood is employed for fencing and 

 building purposes. Systematically the species is closely allied to 



