243 



129. Eucalyptus Bancrofti. 



(J H.M., in i ril Re\ Gen. Euc, vol. |. i | 1917 

 Rocky Gum. 



Systematic. A medium sized tree, usually gnarled, bark smooth, falling 

 off in patches. Abnormal leaves ovate-lanceolate, on Inn-, thin petioles. Normal 

 leaves lanceolate to ovate lanceolate, acuminate, sometimes falcate; venation 

 seldom prominent, intramarginal vein fairly close to the edge, lateral vi ins inclined 

 ,u ni angle "I about 45° to mid-rib. Flowers up to se> en in umbels, the 1 ommon 

 peduncle about \ lines long, axillary. Calyx tube short, about 1 to 2 lines long, 

 somewhat turbinate and contracting shortly to the pedicel; operculum expanded 

 slightly above the top ol the calyx tube, egg-shaped, about 3 lines long; an outer 

 opi rculum first falls off , leaving a line of demarcation at its junction with the calyx 

 tube. 



Fruit. Hemispherical; rim broad, almost ver- 

 tical ; valves prominent, much exserted ; 

 about 2 to 4 lines long and 3 lines in 

 diameter. 



These fruits arc very similar Id those of 

 E. Parramattensis, only larger. 



Habitat. Monaro t" New England Tableland in the 

 interior, and Camden Haven to Grafton on 

 tlir Coast, N' \\ South Wales. 



ESSENTIAL OIL. Leaves and terminal branchlets lor distillation were 

 collected at Tenterfield, N.S.W., in January, 1910. The yield of oil was 0-5 

 per cent. 



The crude oil was of an orange-brown colour, and had an odour indicating 

 a cfheol-pinene oil, with a secondary one somewhat aromatic. The constituents 

 present were laevo-rotatory pinene, phellandrene, cineol, and alcohols. Esters 

 were not very pronounced. 



The crude oil had specific gravity at 15 C. = 0-8982 ; rotation </„ 14-4° ; 

 refractive index at 20 = 1-4721, and was soluble in 1 volume So per cent, alcohol. 

 The saponification number lor the esters and free acid was 12-9; alter acetylation 

 it W as (.1-6, and in the cold with two hours' contact 27-8; the free alcohol 

 . al< ulated for C IO H j8 () was thus S per cent. 



On rectification, 1 per cent, distilled below r.66° ('. corr. . Between 

 166-172°, 10 per cent, distilled ; between 172-178°, 36 per cent, distilled ; between 

 178-193°, 38 per cent, came oxer, and between 193-277°, 12 per cent, distilled. 

 These tractions gave the following results: 



First fraction, sp. gr. at 15° C. 0-8853; rotation,,,, 15-8°; refractive 



index at 20° = I- |d; 3. 

 Second „ ,, ,, =0-8877; rotation a B 16-6°; refractive 



index at 20° = 1-4685. 

 Third ,, ,, =0-8927; rotations 15-7°; refractive 



index at 20° = 1-4699. 

 Fourth ,, ,, ,, =0-9213; rotation 6-0°; refractive 



index at 20 [-4870. 



[Tie cineol, determined in the crude ml by the rapid phosphoric acid method, 



WaS .',') per I ent. 



