BY R. T. BAKER. 415 



(Blackbutt), and no doubt of equal excellence. It is durable in 

 the ground, and free from gum-veins as a rule. Suitable for 

 bridge-decking, wood-blocking, posts, rails, and general building 

 purposes requiring a hard durable timber. In the case of " Red " 

 and "White" Stringybark, the bark soon becomes detached 

 after the timber is felled, but in this species the bark remains 

 attached till the timber decays. 



Kino.— The exudation belongs to the ruby group, consisting 

 principally of a tannic acid and water. Contains neither gum 

 like the kinos of the " Ironbarks," nor eudesmin or aromadendrin 

 like the " Boxes." In constitution it is practically identical with 

 that of E. dextropinea, described below. 



Oil — A deep reddish colour, and it could not be distinguished 

 from that of E. dextropinea except by chemical analysis. The 

 leaves gave a yield of 0-66 per cent , and it consists very large]}' 

 of lajvo-rotatory pinene, chemically identical with the Ifevo-rotatory 

 pinene obtained from trees of the Katural Order Coniferse. 



For the chemistry of this pinene see paper by my colleague, 

 Mr. H. G. Smith, Proc. Roy. Soc. N.S.W., Oct., 1898. 



Hah. — Nullo Mountain, Rylstone (J. Dawson), Never Never 

 Mountain, Rylstone (R.T.B.), Gulf Road, Rylstone (R.T.B.) 



This tree has always been regarded by local residents of the 

 Rylstone district as quite distinct from any of the other " Stringy- 

 bark " trees in the locality, owing to its peculiar bark and tough 

 wood, and the glinting of the leaves in the sun, making them 

 appear glaucous, and hence its vernacular name of " Silver-Top 

 Stringybark." When seen growing in its native habitat it some- 

 what resembles E. viacrorhyncha, F.v.M., and the mature fruits 

 with the domed rim and well exserted valves might easily lead one 

 to diagnose it as that species, but it differs therefrom in its 

 hard durable timber, and also from it and cognate species by its 

 characteristic bark, as well as in its hemispherical operculum, 

 terete calyx tube, in its obliqvie leaves, and the physical con- 

 stituents of its leaves and oil. Except for its domed fruits there 

 is little to connect it botanically with E. macrorhyncha, F.v.M., 



