94. Eucalyptus tereticornis, Sm., var. cineolifera (nobis). 



Red Gum. 



Systematic. A tree attaining a height of 80 feet and over, 2 feel in 

 diameter, with a smooth, yellowish bark, blotched with dark-brown patches. 

 Normal leaves coarse, broad-lanceolate to lanceolate, thick, coriaceous, often 

 falcate, acuminate, usually under .6 inches long and 2 inches broad ; sometimes 

 abnormally narrow-lanceolate, more acuminate and thinner in texture; venation 

 fairly distinct, intramarginal vein looped and much removed from the edge, 

 lateral veins distant, irregularly branched, anastomosing and scarcely parallel. 

 Peduncles axillary or lateral, angular, about 5 lines long, bearing umbels of five 

 to seven flowers. Buds shortly pedicellate; calyx tube turbinate, if lines long; 

 operculum conoidal, sometimes slightly curved, 4 lines in length on pedicels i 

 to 2 lines long. 



Fruit. Hemispherical, shining, wrinkled, domed; 

 the rim continuing the curve of the lower 

 portion of the fruit ; valves well exserted 

 and expanded ; 2 lines long and 2\ lines in 

 diameter. 



Scarcely any difference exists between the shape of 

 these fruits and its type. 



Habitat. Armidale, Marulan, New South Wales. 



ESSENTIAL OIL. Leaves and terminal branchlets for distillation were 

 received from Marulan, N.S.W., in July, 1898. The yield of oil was 0-9 per cent. 

 The crude oil was red in colour and had an odour similar to those of the cineol- 

 pinene oils in which aromadendral occurs. The oil was somewhat rich in cineol, 

 thus differing from that of E. tereticornis itself. It also contained much less 

 aromadendral. These two oils are analogous with those of E. punctata and 

 E. punctata var. didyma, although reversed in the former case. The oil of 

 E. tereticornis var. cineolifera contains pinene but not phellandrene. Esters were 

 not pronounced, nor were volatile aldehydes present but in small amount. The 

 oil contained some sesquiterpene. 



The crude oil had specific gravity at 15 C. = 0-9112; rotation a v + 0:6; 

 refractive index at 20 = 1-4703, and was soluble in if volumes 70 per cent, 

 alcohol. The saponification number for the esters and free acid was 3-7. 



On rectification, i per cent, distilled below 168 C. (dorr.). Between 

 168-183, 74 per cent, distilled; between 183-250, 10 per cent, came over, and 

 between 250-265, 9 per cent, distilled. These fractions gave the following 

 results : 



First fraction, sp. gr. at 15 C. = 0-9022; rotation a D + 2.1. 

 Second = 0-9071 ; a,. - - 3-0. 



Third : 0-9341 ; ,, too dark. 



The cineol was determined by the phosphoric acid method in the portion 

 boiling below 183; the result indicated 45 per cent, in the crude oil (O.M.). The 

 Isevo-rotation was due to the aromadendral. 



