130 



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



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

 Gardens of that city, and forwarded to us lor investigation. The yield of oil 

 was 0-82 per cent. The crude oil was but little coloured, and had an odour 

 similar to those of the cineol-pinene oils generally, although the volatile 

 aldehydes were rather pronounced. The constituents present were dextro- 

 rotatory pinene, cineol, esters, alcoholic bodies, and a little sesquiterpene. 

 Phellandrene was not present, nor was it expected to occur in oils of this group. 

 The crude oil had specific gravity at 15 C. = 0-9103 ; rotation a D + 10-2, 

 refractive index at 20 = 1-4639; and was soluble in if volumes 70 per cent. 

 alcohol. The saponification number for the esters and free acid was 15-2, and in 

 the cold with 2 hours' contact 2-8. After acetylation it was 49-5, and in the cold 

 37-6. This result represents 9-6 per cent, free alcohols, having the C IO H I8 O 

 molecule. 



On rectification, 2 per cent, distilled below 156 C. (corr.). Between 

 156-172, 31 per cent, distilled; between 172-193, 59 per cent, came over; 

 between 193-217, 5 per cent, distilled, and between 217-235, 2 per cent. The 

 fractions gave the following results : 



First fraction, sp. gr. at 15 C. = 0-8950; rotation D + 16-2; refractive index 



at 20 = 1-4601. 

 Second ,, ,, = 0-9123 ; rotation D + 8-7 ; refractive index 



at 20 = 1-4629. 

 Third ,, ,, =0-9350; rotation D 1-2; refractive index 



at 20 = 1-4731. 

 Fourth ,, ,, =0-9385; rotation too dark ; refractive index 



at 20 = 1-4811. 



The cineol was determined by the resorcinol method in the portion 

 distilling between 156-193; when calculated for the original oil the result was 

 63 per cent. By the phosphoric acid method, determined in the crude oil, it 

 was 48 per cent. It is thus apparent that constituents other than cineol were 

 absorbed by the resorcinol. 



A similar alcohol to that in the oil of E. longicornis was present, and 

 altogether the results with the oils of the two species were in close agreement. 



A later distillation with material of this species was made by Mr. St. John, 

 with the result that this oil was quite similar in character with the above, and 

 did not contain phellandrene. 



(For a determination of the oil of this species see Proc. Roy. Soc., Victoria, 

 Vol. 28, 1915, by Mr. J. C. Earl.) 



69. Eucalyptus calycogona. 



(Turcz. Bull. Phys.-Math. Acad., Petersb., 10, p. 338, 1852.) 

 Gooseberry Mallee. 



Systematic. A "Mallee" growing in wetter situations than generally 

 obtains in this class of Eucalypts (W. Gill). Abnormal leaves sometimes alternate, 

 or shortly petiolate, sessile, narrow, elliptical or lanceolate, mucronate, about i 

 inch long. Normal leaves lanceolate, thick, acuminate, hooked, shining, about 3 

 inches long and \ inch wide ; intramarginal vein parallel to and shortly removed 

 from the edge, venation not prominent. Flowers in axillary umbels, common 

 peduncle about 3 lines long. Buds about 7 lines long, covered with oil glands ; 



