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

 came over below 15N C. (corr.). Between 158 172 , 53 per cent, distilled; 

 between 172-183°, 27 per cent, tame over; between iS 5-227°, only 5 per cent. 

 distilled, and between 227 2b<>'\ 6 per cent, distilled. These tractions 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. 

 Calvx tube oblong, turbinate ; operculum about 1] inch long, tapering to the 

 end, obtuse. 



Fruit.— Closely crowded in a cluster at the head 



of peduncle, bell-shaped, sessile or shortly t^ik 



pedicellate; rim narrow, surmounted by the ' 'A ) $^fijjii 



valves, which connive and form a very xVl^^^^B^^^ 

 conspicuous dome ; 4 lines in length, exclu- ^^^&^Zf8$&t&. 

 sive of the much exserte 1 valves. '^$edr\ ^&m^ 



.1/ first appearance thev s/iok' a resemblance to those of ^"'"'^gl&CJjPf 



E. Lehmanni, hut are quite separate ami distinct from H "w 



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



arc thev immersed in the receptacle as obtains in 



E. Lehmanni. The two species have been confused by ™ 



same systematists. 



Habitat. — Western Australia. 



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



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

 Gardens of that city. The vield 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, amvl 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 a D + io-i°; 

 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 



