with a marginal one somewhat removed Iroin the edge. The oil glands are fairly 

 plentiful. The flowers are not numerous and occur in axillary peduncles, the 

 calyx being elongated, and the operculum shortly acuminate. 



Fruit. Urn-shaped, contracted at top with a 

 narrow groove, at outer edge of a counter- 

 sunk rim ; valves not exserted and run- 

 ning vertically from the base of the rim; 

 5 lines long and as broad. 



'I' lie siiiiil/er fruits are very similar to those of the 

 l-l uster ii CtKis/ii/ species, E. pilularis. 



Habitat. \\VMrru Australia. 



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

 St. John, in January, 1917, from trees cultivated in Melbourne, Victoria, and 

 forwarded to the Technological Museum for investigation. The yield of oil was 

 equal to i-i per cent. The crude oil was of a lemon-yellow colour, and had a 

 terpene-like odour, while that of volatile aldehydes was very pronounced. The 

 principal constituent was dextro-rotatory pinene. Cineol was only present in 

 very small amount. Esters were determined, the principal being butyl-butyrate 

 in the lower boiling fraction, terpinyl-acetate and geranyl-acetate in the higher. 

 Free geraniol and free terpineol were also present. 



The crude oil had specific gravity at 15 C. ; 0-8948; rotation a D + 

 20-5; refractive index at 20 1-4671, and required 4 volumes 80 per cent, 

 alcohol to form a clear solution. The saponification number for the esters and 

 free acid was 50-7. In the cold with two hours' contact it was 11-3. After 

 acetylation the saponification number was 101-5. 



On rectification no less than 2 per cent, came over below 122 C. (corr.). 

 Between 122-172, 47 per cent, distilled; between 172-183, 20 per cent, distilled, 

 leaving a residue of 31 per cent, boiling above 183 C. These fractions and 

 residue gave the following results : 



First large fraction, sp. gr. at 15 C. : - 0-8725 ; rotation </ + 24-6 ; refrac- 

 tive index at 20 = 1-4626. 



Second ,, ,, ,, =0-8878; rotation + 18-4; refrac- 



tive index at 20 = 1-4698. 



Residue ,, ,, =0-9342; rotation a a + 16-2; refrac- 



tive index at 20 = 1-4731. 



The saponification number for the first fraction was 16-4; for the 

 second, 31-4; and for the residue, 104-2. The ester in the first fraction was 

 mostly butyl-butyrate. 



The volatile acids of the several esters were determined in the usual way, 

 by saponification, formation of the barium salt, and decomposing this with 

 sulphuric acid. The barium salt gave 88-12 per cent, barium sulphate, equal 

 to 80-2 per cent. . barir.m acetate, and 19-8 per cent, barium butyrate. The 

 odour of butyric acid was pronounced during the reaction. 



A portion of the crude oil was distilled, and all below 190 C. removed, 

 this equalled 68 per cent. The higher boiling portion had saponification number 

 129-7, while in the cold with two hours' contact it was 34-2. The whole was 

 then saponified by boiling with alcoholic potash, the aqueous portion separated, 

 and the oil thoroughly washed. It was then distilled at 10 millimetres pressure ; 

 most of it being obtained between 98-105 C. On again redistilling at the same 



