82 



REMARKS. One oi the besl known trei in tl di trid ol these States. Thi unon I 



i little confusing, as several othei peel with a smooth bark are known by thai name. The 



i .1! one time placed as a maculala, bul the analog} is onl) in the 



liape of the Iruits. rhi two otherwise are quite distind rhi chief ecoi i E. man ulata is t1 timber, which 



: ill', i achbuilding. It is a splendid bending v I 



ESSENTIAL OIL. — Leaves and terminal branchlets for distillation were 

 obtained from Currawang Creek, N.S.W., in July, i N<,s. The yield of oil was 



I per cent. The crude oil was of a light orange-brown colour, and had a 

 turpentine-like odour, with an aromatic secondary one. A somewhat large 

 amount ol pinene was present, but phellandrene was absent. Cineol occurs 

 in fair amount. The third fraction consisted largely of the sesquiterpene. 

 The predominance of the terpenes accounts for the comparative insolubilitv 

 of the oil in alcohol, it requiring i volume of 80 per cent, alcohol to form 

 a clear solution. The aldehyde citronellal does not appear to occur in the oil 

 ot this species even in traces, so that in cases where this aldehyde has been re- 

 corded 'f or the oil of E. maculata, that of E. citriodora had been worked upon. 



The crude oil had specific gravity at 15 C. = 0.9201 ; rotation a„ + 7-7°; 

 refractive index at 20° = 1-4804. The saponification number for the esters and 

 free acid was 9-5. 



On rectification, 2 per cent, distilled below 166 C. corr. i. Between 

 166-183 , 43 per cent, distilled; between 183-260 , 22 per cent, came over, and 

 between 260-280 , 27 per cent, distilled. The last fraction consisted very largely 

 of the sesquiterpene. The fractions gave the following results : — 



First fraction, sp. gr. at 15 C. = 0-8925; rotation, a D -\- 14-01°. 



Second ,, ,, = 0-9020; ,, 4- 8-9°. 



Third „ ,, „ = 0-9431; „ + 3-58°. 



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

 fraction. The result was 39 per cent., which represents about 18 per cent, in the 

 crude oil (O.M.). 



To test the constancy of the oil products of this species material was 

 obtained from Woodburn, in the north-east corner of New South Wales, the 

 previous consignment having come from the south-eastern portion of that 

 State. The oil was distilled in September, 1901, so that more than three years 

 'separate the two distillations. There was a close agreement between the two 

 samples of oil, the physical and chemical characters being in accord. The higher 

 specific gravity of the Currawang Creek sample was due to a larger amount of 

 the sesquiterpene. Pinene was present in quantity, but phellandrene was absent. 

 The cineol determined by the phosphoric acid method gave 20 per cent. (O.M.). 

 The specific gravity of the crude oil at 15° C. = 0.8959 ; optical rotation a v + 5-1°. 

 The saponification number of the esters was 6-5. The crude oil required 4 volumes 

 80 per cent, alcohol to form a clear solution. 



The sample from Woodburn had been stored in the dark, and in August, 

 1919, was again analysed. But little change had taken place in the crude oil 

 during the eighteen years it had been kept. The crude oil and the fraction gave 

 the following results. 60 per cent, distilled below 190° C. :— 



Crude oil, sp._ gr. at 15° C. = 0-9095; rotation </„ + 5-0°; refractive 



index at 20° = 1-4814. 

 Fraction ,, „ = 0-8877; rotation « c 4- 4. 5 ; refractive index 



at 20° = 1-4701. 

 The cineol was determined by the resorcinol method in the fraction, and 

 calculated for the crude oil ; the result was 25 per cent. By the rapid phos- 

 phoric acid method it was 21 per cent, when calculated for the crude oil. 



