REMARKS. It is an umbrageous tree attaining a height from |0 to ioo feel and a diameter u] 

 luit osuall) i iall) .1 swampK)] pei ii s 



LabiU and E. Gunnii the former is a Wi ralian species and the latter is fully shown 



in this and otlier publications to be als-j distinct. From i it is easily distinguisl iallyso 



in older trees, the leaves being broader and more oval and tl"- api \ quite blunt, sometimes obcordate, whilst tin- 

 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 I In yield 

 .■l oil was i-.; i per cent. The crude oil was amber coloured, and had an odour 

 resembling those belonging to the cineol-pinene class, but with .1 pronounced 

 odour "I volatile aldehydes. Eudesmol was present in considerable quantity. 

 The oil was rich in cineol, contained pinene, bu1 phellandrene was absent. At 

 one time a good deal oi oil was distilled commercially from this species in New 

 South Wales. 



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

 refractive index at 20' = 1-4676; and was soluble in i\ volume-, 70 per cent. 

 alcohol. The saponification number for the esters and in e a< id was 4-4. 



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

 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 a B + 1-45 

 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 oi eudesmol, that the fraction containing it solidified in the receiver. 

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

 the time oi the vear, and the eudesmol content, appeal to have on the formation 

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

 cation 63 per cent, distilled below 183 . This fraction had sp. gr. at 15 = 0-8967 ; 

 and rotation (/„ 4- 0-75°, and a determination for cineol by the phosphoric acid 

 method gave 33 per cent. (O.M. . No less than 18 percent, 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. nun. t. WVllI and XXIX.) 



A Blue Gum. 



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

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

 always a tall straight growing tree, attaining a height up to [50 or even 200 feet, 

 with a diameter up to | feet, with .1 -mouth bark, chalky white, or bluish, hem e 

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

 chalky white, round, or heart shaped, -essile and stem 1 lasping on the sharply 

 angular and winged branchlets, gradual!} bei oming alternate, petiolate, lanceolate 



