20Q 



On rectification, 2 per cent, distilled below 169 C. (corr.). Between 

 169-183, 48 per cent, distilled; between 183-224, 26 per cent, came over, and 

 between 224-240, 10 per cent, distilled; leaving 14 per cent, boiling above 

 240 C., which consisted largely of the sesquiterpene. The fractions gave the 

 following results : 



First fraction, sp. gr. at 15 C. : : 0-8876; rotation a D - 3-73. 



Second ,, = 0-8975; ,, a D - - 12-02. 



Third ,, ,, : 0-9429; ',, not taken. 



The light did not pass well with the third fraction, but it was strongly 

 laevo-rotatory. The figures show the presence of a considerable amount of 

 aromadendral. 



In July, 1910, material of this species was received from near Parramatta, 

 N.S.W., forwarded for distillation by Dr. Cuthbert Hall. The yield of oil was 

 0-4 per cent. The crude oil was in agreement with that from Barber's Creek, 

 and contained similar constituents in about the same amounts. Cineol did not 

 exceed 10 per cent. 



The crude oil had specific gravity at 15 C. = 0-9158 ; rotation a,, -- 11-8 ; 

 refractive index at 20 : 1-4906, and was soluble in i volume 80 per cent, alcohol. 

 The slightly higher rotation was due to an increased amount of aromadendral. 



108, Eucalyptus punctata, var. didyma. 



(R.T.B. & H.G.S., in Euc. and their Ess. Oils, Edit. 1902, p. 127.) 



Iron-wood. 



Systematic. This variety is distinguished from the type by its having 

 two opercula to each bud and by the difference in its oil. The outer operculum 

 is thin, and is shed very early in the budding stage, so that it is scarcely ever to 

 be found in herbarium material. The fruit always has a broad groove below 

 the rim, and like the leaves are always larger and thicker than those of the type, 

 while the wood is more open in the grain and less interlocked. Otherwise, 

 morphologically, there is little to distinguish it from the type. 



Habitat. Blue Mountains, Rylstone, Barber's Creek, Lismore, 

 Colo Vale, New South Wales. 



ESSENTIAL OIL. The oil obtained from this variety of E. punctata, 

 from material collected at various localities outside the Sydney district, differed 

 considerably from that obtained from the type growing in the neighbourhood 

 of Sydney. Although the constituents were similar in both cases, yet they varied 

 greatly in the amounts, and the cineol in the oil of the variety was considerably 

 less than in that of E. punctata itself. 



