Naturalisation in Extra-Tropical Countries. 7 



quality, but often of amber-colour. This is the principal species used 

 for tanners' bark in South-Africa. In Kaffraria it is the only bark so 

 employed [Sim]. Leucospermum conocarpum (R. Br.) is also ex- 

 tensively employed for the same purpose [McGibbon], though it 

 imparts an unpleasant odor to the leather made with it [MacOwan]. 

 Stirring the seeds for some few minutes in hot water stimulates their 

 power of germination, particularly if they are old [B. Hellier]. 



Acacia implexa, Bentham. 



Victoria, New South Wales, Queensland. A tree of middle size, 

 content with poor soil. Wood firm and close, dark-brown with 

 yellowish stripes ; much in demand for turnery, cogwheels and other 

 purposes, which need tenacity and strength [Dickinson]. Bark 

 available for tanneries. Foliage extremely bitter. Flowers much 

 later in the season than most of the numerous other Australian 

 species, about 300 being distinguishable. 



Acacia Koa, A. Gray. 



Hawaii ; there one of the most valuable of timber-trees. Stem 

 reaching a height of 60 feet, topped by wide-spreading phyllodi- 

 nous foliage. Wood easy to work, particularly in a fresh state ; 

 formerly much used for boat-building and for building purposes 

 generally ; also suitable for cabinet-work. Species of Metrosideros, 

 some ascending to 8,000 feet, one over-topping all other trees, furnish 

 a large share of hard, tough and very durable timber in the Hawaian 

 islands. Their wood varies from a light red to a purplish hue [Hon. 

 Judge McCully]. 



Acacia leioph.ylla, Bentham.* (A. saligna, Bentham not Wendland.) 



South- Western Australia, where it is the principal tree chosen for 

 tanners' bark. It is a wide-spreading small tree, fit for avenues ; 

 emitting suckers. The weeping habit fits it particularly also for 

 cemeteries. It conies into flower simultaneously with the Cherry- 

 tree, or somewhat later, and blooms profusely. The bark contains 

 nearly 30 per cent, of mimosa-tannin, and is extensively used by 

 tanners in West-Australia. Perfectly dried leaves yield from 7 to 

 8 per cent, mimosa- tannic acid, giving a lead-precipitate of a light 

 yellow colour ; the leaves contain also a considerable quantity of 

 sulphate of lime. The London price of fair West- Australian gum 

 from this species was from 46s. to 49s. per cwt. in 1879. The tree 

 has proved in Algeria to resist the sirocco better than most species 

 [Dr. Bonand]. Cultivated extensively in South- Africa also for tan- 

 bark. A. cyanophylla (Lindley) is a closely allied species, serving 

 the same purposes. 



Acacia longifolia, Willdenow. 



South-Eastern Australia. This tree is introduced into this list, 

 inasmuch as the very bushy variety, known as A. Sophorae (R. 



