97 



REMARKS.- -Dedicated to /.,</> A llMisto, C.M.G., who investigated many <>i the prodii. ts <jl the Kucalypts, 

 especially their essential oils. The name " Red Box" has recently been given to it. Imt it is dillieiilt to under- 

 stand how it can apply, as the timber i-, <|iiite pale, being yellowish-white to yellowish-pink ; it is a beautiful tmiln r 

 tor working, having a close grain, and much resembles English Hox. It is very durable, both in the ground and for 

 bridge decking, and altogether is a tree worthy of cultivation. 



ESSENTIAL OIL. Leaves and terminal branrhlc.ts for distillation were 

 obtained from Barber's Creek, New South Wales, in August, 1898. The yield 

 of oil was 0-97 per rent. The crude oil was orange-brown in colour, and had an 

 odour resembling those of the cineol-pinene class of Eucalyptus oils generally. 

 Pinene was the principal terpene, and cineol was present in some quantity, 

 but phellandrene was absent, and the esters quite small in amount. Terpineol was 

 detected. The volatile aldehydes were pronounced. The fourth fraction con- 

 sisted largely of the sesquiterpene. 



The crude oil had specific gravity at 15 C. = 0-9078; rotation + 9-26; 

 refractive index at 20 1-4675, and was soluble in 5 volumes 70 per cent, 

 alcohol. The saponification number for the esters and free acid was 3-2. 



On rectification, 2 per cent, distilled below 167 C. (con.). Between 

 167-172, 41 per cent, distilled; between 172-183, 40 per cent, came over; 

 between 183-250, 8 per cent, distilled, and between 250-265, 3 per cent, 

 distilled. These fractions gave the following results : 



First fraction, sp. gr. at 15 C. := 0-8981; rotation a D + 13-4- 



Second = 0-9096; + 7-37. 



Third ,, ,, ,, = 0-9189; ,, not taken. 



Fourth ,, ,, ,, = 0-9376; 



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

 boiling below 183, was 43 per cent. (O.M.); indicating about 35 per cent, in the 

 crude oil at time of distillation. 



The above sample had been stored in the dark, and in August, 1919, was 

 again analysed. 84 per cent, distilled below 190 C. There was an apparent 

 increase in the cineol content, as is indicated by the physical properties as well 

 as by the quantitative determinations. The crude oil and the fraction gave the 

 following results : 



Crude oil, sp. gr. at 15 C. = 0-9302; rotation D + 9-4; refractive index 



at 20 1-4679-. 

 Fraction ,, ,, = 0-9134; rotation a D + 9-0 ; refractive index 



at 20 = 1-4633. 



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

 calculated for the crude oil; the result was 63 per cent. A determination by 

 the rapid phosphoric acid method on the fraction and calculated for the crude 

 oil gave 58 per cent, of cineol. The difference was largely due to the terpineol. 



