On rectification a rather large amount of acid water and volatile aldehydes 

 Came over below 158 C. (corr.). Between 158-172, 53 per cent, distilled; 

 between 172-183, 27 per cent, came over; between 183-227, only 5 per cent, 

 distilled, and between 227-260, 6 per cent, distilled. These fractions gave the 

 following : 



First fraction, sp. gr. at 15 C. = 0-8893; rotation a D + 9-7. 



Second = 0-9059; ,, + 1-3. 



Third ,, ,, = 0-9084; ,, - 2-9. 



The cineol determined by the phosphoric acid method was 29 per cent. 

 (O.M.). The higher boiling portion consisted largely of the sesquiterpene. 



43. Eucalyptus cornuta. 



(Labill., Voy. I, 403, t. 20, 1799.) 

 Yate Gum. 



Systematic. A tree of moderate size with a smooth bark on the upper 

 branches, but dark and rugged lower down, approaching that of an " Ironbark." 

 Abnormal leaves orbicular or ovate. Normal leaves lanceolate, or ovate-lanceo- 

 late, thick, usually under 4 inches long; venation not prominent, intramarginal 

 vein somewhat removed from the edge, lateral veins moderately oblique. Flowers 

 six to twelve not immersed in the receptacle,' sessile on an axillary peduncle. 

 Calyx tube oblong, turbinate ; operculum about ij(- inch long, tapering to the 

 end, obtuse 



Fruit. Closely crowded in a cluster at the head 

 of peduncle, bell-shaped, sessile or shortly 

 pedicellate ; rim narrow, surmounted by the 

 valves, which connive and form a very 

 conspicuous dome; 4 lines in length, exclu- 

 sive of the much exserted valves. 



At first appearance they show a resemblance to those of 

 E. Lehmanni, but are quite separate and distinct from 

 each other, and do not coalesce as in that species, nor 

 are they immersed in the receptacle as obtains in 

 E. Lehmanni. The two species have been confused by 

 some systematists. 



Habitat. Western Australia. 



ESSENTIAL OIL.- The oil of this species was distilled by Mr. P. R. H. 



St. John, at Melbourne, in September, 1919, from cultivated trees in the Botanic 

 Gardens of that city. The yield of oil he obtained was 1-2 per cent. The 

 crude oil was light in colour and contained a large proportion of volatile aldehydes, 

 principally valeraldehyde. The constituents present were dextro-rotatory pinene, 

 cineol, amyl alcohol, a butyric acid ester, higher boiling alcohols, and a little 

 sesquiterpene. Phellandrene was absent. 



The crude oil had specific gravity at 15 C. = 0-9043, rotation D + 10-1; 

 refractive index at 20 = 1-4601, and was soluble in 2 volumes 70 per cent, alcohol. 

 The saponification number for the esters and free acid was 25-4, and in the cold 



