110 H. G. SMITH. 



Hall. Although the leaves are much smaller and narrower 

 than those of the other species, yet, the venation is similar. 

 The oil glands in the fresh leaves are more pronounced in 

 this species than in the others, and this is also indicated by 

 the greater yield of oil. 



Chemistry. — This material was collected in the neigh- 

 bourhood of Parramatta, in the month of October, and 

 consisted of fresh leaves and terminal branchlets, cut as 

 for commercial oil distillation. The average yield of oil 

 was 0*31 per cent. 



The crude oil was light lemon coloured, had an indistinct 

 odour at first, but distinctly a secondary aromatic one. 

 The chief constituents were dextro-rotatory pinene, 

 geraniol, geranyl-acetate, geranyl-valerianate, a small 

 amount of a sesquiterpene, together with a little volatile 

 aldehyde, and most probably a minute quantity of amyl- 

 acetate. No other terpene than pinene was detected and 

 cineol was quite absent. The botanical evidence is also 

 against the presence of either phellandrene or cineol in 

 the oil. 



The crude oil had specific gravity at 15° O. = 0*8719; 

 rotation a D = + 35°. 6; refractive index at 22° = 1*4660; 

 and was insoluble in 10 volumes 80 per cent, alcohol by 

 weight. 



On the rectification of 100 cc. of the oil, a small amount 

 of acid water with some low boiling aldehyde, and a con- 

 stituent with a pear-like odour, came over below 155° O. 

 (corr.). Between 155 - 160°, 57 per cent, distilled; and 

 between 160 - 172°, 24 per cent. The thermometer then 

 quickly rose to 220°, and between that temperature and 

 250°, 6 per cent, distilled, with some decomposition. These 

 fractions gave the following results : — 



