313 



ESSENTIAL OIL. Leaves and terminal branchlets for distillation were 

 obtained from Rylstone, N.S.W., in August, 1898. The yield of oil was 0-3 per 

 cent. The crude oil was of an amber colour, and had an odour corresponding 

 to that of the phellandrene Eucalyptus oils. Phellandrene was present in con- 

 siderable quantity, but pinene only in small amount. Cineol was only found in 

 small amount in the first fraction. The peppermint ketone, piperitone, was not 

 pronounced, but a constituent having a cinnamon-like odour was present in the 

 second fraction. The third fraction consisted largely of the sesquiterpene. 

 Crystallised eudesmol was not detected. 



The crude oil had specific gravity at 15 C. = 0-871 ; rotation a D -- 22-7; 

 refractive index at 20 = 1-4845, and was insoluble in 10 volumes 80 per cent, 

 alcohol. The saponification number for the esters and free acid was 2-1. 



On rectification, i per cent, distilled below 173 C. (corr.). Between 

 173-183, 80 per cent, distilled; between 183-245, n per cent, came over, and 

 between 245-266, 4 per cent, distilled. These fractions gave the following 

 results : 



First fraction, sp. gr. at 15 C. := 0-863; rotation a D -- 24-6. 



Second ,, ,, ,, = 0-880; ,, - 19-7. 



Third =0-931; ,, 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-one 

 years the oil had been kept, although the phellandrene had suffered some loss 

 in rotation. 83 per cent, distilled below 190 C. The crude oil and the rectified 

 portion gave the following results : 



Crude oil, sp. gr. at 15 C. := 0-8782; rotation a D 



at 20 i '4844. 



Rectified portion ,, =0-8644; rotation a D 



at 20 = 1-4801. 



17-4; refractive index 

 21-5; refractive index 



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

 when calculated for the crude oil, the result was 8 per cent. 



169. Eucalyptus Macarthuri. 



(H.D. & J.H.M., Proc. Linn. Soc., N.S.W., 1899, p. 448, t. XXXVIII.) 

 Paddy's River Box, Camden Woollybutt. 



Systematic. A medium-sized tree, with a rough, somewhat :< Box "-like 

 bark. Abnormal leaves linear-lanceolate, slightly cordate, barely stem clasping, 

 sessile, and opposite, bright green in colour, of similar tint on both sides. 

 Normal leaves alternate, narrow lanceolate, often falcate, thickish, of equal 

 colour on both sides; venation not prominent, intramarginal vein at some 

 distance from the edge. Umbels axillary, with short, scarcely flattened peduncles, 



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50068 X 



