296 



On rectification, 2 per cent, distilled below 174 C. (corr.). Between 174- 

 193, 80 per cent, distilled ; between 193-245, 4 per cent, came over, and between 

 245-280, 9 per cent, distilled. These fractions gave the following results : 



First fraction, sp. gr. at 15 C. = 0-8646 ; rotation D - - 30-8. 



Second ,, ,, ,, = 0-9147; ,, not taken. 



Third ,, ,, ,, =0-9377; ,, not taken. 



The above sample was stored in the dark, and in November, 1919, was 

 again analysed. Very little alteration had taken place during the twenty years 

 the oil had been kept, except that the optical rotation was reduced about 7 degrees. 

 This alteration is apparently due to the phellandrene, as the loss in the rectified 

 portion was about 5 degrees. 53 per cent, distilled below 190 C. The crude oil 

 and the rectified portion gave the following results : 



Crude oil, sp. gr. at 15 C. = 0-9012; rotation a D - - 15-4; refractive index 



at 20 : 1-4884. 

 Rectified portion ,, =0-8636; rotation a D -- 25-8 ; refractive index 



at 20 = 1-4806. 



The cineol was determined by the resorcinol -method in the rectified portion ; 

 when calculated for the crude oil the result was 2 per cent. 



160. .Eucalyptus Delegatensis. 



(R.T.B., Proc. Linn. Soc., N.S.W., 1900, p. 305, t. XVI.) 

 Silver-topped Mountain Ash. 



Systematic. A very tall tree, occurring on the top of mountain ranges in 

 the south-east corner of New South Wales, also Victoria, and Tasmania. Bark 

 stringy, reddish, extending well up the trunk. Abnormal leaves large, broadly 

 lanceolate, oblique ; venation prominent, spreading, intramarginal vein removed 

 from the edge. Normal leaves comparatively large, often 9 inches long and 2 inches 

 broad, lanceolate, acuminate ; venation prominent, lateral veins spreading, intra- 

 marginal vein removed from the edge. Peduncles axillary, about 6 lines long, 

 slightly compressed, bearing from six to ten flowers. Buds clavate, 6 to 7 

 lines long ; calyx tube short, merging into a pedicel 3 to 4 lines long ; operculum 

 hemispherical, obtuse. 



Fruit. Pyriform ; rim thick, truncate or counter- 

 sunk ; valves small, not exserted ; about 

 4 lines long and 3 lines broad. 



The fruits are uncommonly like those of E. Sieberiana 

 and E. obliqua. 



Habitat. Delegate Mountain, lower sides of Snowy Mountains, 

 New South Wales ; Victoria; Tasmania. 



REMARKS. It is difficult, from herbarium specimens to differentiate this species from E. Sieberiana, 

 F.v.M., and E. obliqua, L'Her. The leaves are also similar to those of E. Icevopinea, R.T.B., but in the fruits and 

 in its economic products it is quite distinct from that species. The buds are very similar to those of E. /Sieberiana, 

 F.v.M. , but the timber, bark, and oil show it not to be that species, and the same may be said of E. obliqua. Maiden 

 (Viet. Nat., vol. XVIII, p. 124) places this species as E. dives, Schau., from which Eucalyptus we find it differs in 

 abnormal leaves, mature leaves, bark, timber, and the presence of an aroma in its leaves which is entirely absent 

 from the true E. dives', he later places it with E. gigantea, Hooker's name for E. obliqua. We have fully discussed 

 the claims of this species to specific rank in our " Eucalypts of Tasmania, and their Essential Oils," Roy. Soc. Tas., 

 1912, and where we show it is not E. gigantea. It can always be determined in the herbarium by the perfume 

 emanating from the leaves when the box in which the material is contained is opened. 



