"3 



REMARKS. -It is an umbrageous tree, attaining a height from 30 to 100 feet, and a diameter up to 3 feet, 

 but usually rather crooked and essentially a swamp or wet ground species. It must not bo confused with other species 

 such as /:'. ovata, Labill and /;'. Gurinii ; the former is a Western Australian species, and the latter is fully shown by us 

 in this and other publications to be also distinct. From E. paludosa, K.T.B., it is easily distinguished, especially so 

 in older trees, the leaves being broader and more oval, and the apex quite blunt, sometimes obcordate, whilst the 

 timbers readily differentiate the species. 



ESSENTIAL OIL. Leaves and terminal branchlets for distillation were 

 obtained from Heydon's Bog, Delegate, N.S.W., in February, 1899. The yield 

 of oil was 1-34 per cent. The crude oil was amber coloured, and had an odour 

 resembling those belonging to the cineol-pinene class, but with a pronounced 

 odour of volatile aldehydes. Eudesmol was present in considerable quantity. 

 The oil was rich in cineol, contained pinene, but phellandrene was absent. At 

 one time a good deal of oil was distilled commerciallv from this species in New 

 South Wales. 



The crude oil had specific gravity at 15 C. = 0-9071 ; rotation a + 1-3; 

 refractive index at 20 = 1-4676; and was soluble in ij volumes 70 per cent, 

 alcohol. The saponification number for the esters and free acid was 4-4. 



On rectification a few drops came over below 160 C. ; the thermometer 

 then rose rapidly to 170 (corr.). Between 170-190, 91 per cent, distilled, the 

 remainder consisted almost entirely of eudesmol. 



The rectified oil had sp. gr. at 15 = 0-9065; rotation D + i'45- 

 The cineol determined by the phosphoric acid method was 54 per cent. (O.M.), 

 indicating about 50 per cent, in the original oil. 



Material of this species was also obtained from Rylstone, N.S.W., in 

 September, 1898. The oil at this time of the year was found to contain such an 

 abundance of eudesmol, that the fraction containing it solidified in the receiver. 

 The oil was less rich in cineol than the Delegate sample, illustrating the influence 

 the time of the year, and the eudesmol content, appear to have on the formation 

 of cineol. The specific gravity of the crude oil at 15 = 0-9167. On rectifi- 

 cation 61 per cent, distilled below 183. This fraction had sp. gr. at 15 = 0-8967 ; 

 and rotation a D + 0-75, and a determination for cineol by the phosphoric acid 

 method gave 33 per cent. (O.M.). No less than 18 per cent, distilled between 

 270-283, which fraction consisted almost entirely of eudesmol. 



58. Eucalyptus Maideni. 



(F.v.M., Proc. Linn. Soc., N.S.W., 1889, p. 1020, t. XXVIII and XXIX.) 



A Blue Gum. 



Systematic. -Known as " Blue Gum " and " Spotted Gum " in different 

 localities, and erroneously recorded as E. globulus from the Araluen district. It is 

 always a tall straight growing tree, attaining a height up to 150 or even 200 feet, 

 with a diameter up to 4 feet, with a smooth bark, chalky white, or bluish, hence 

 its name " Blue Gum." The abnormal leaves are very large, glaucous or even 

 chalky white, round, or heart shaped, sessile and stem-clasping on the sharply 

 angular and winged branchlets, gradually becoming alternate, petiolate, lanceolate 



