78 



On rectification i per cent, distilled below 152 C. (corr.). Between 

 152-170, 55 per cent, distilled; between 170-193, 30 per cent, came over, and 

 between 193-255, 9 per cent, distilled. These fractions gave the following 

 results : 



First fraction, sp. gr. at 15 C. : : 0-885; rotation a u + 23-6; refractive 



index at 20 = 1-4601. 

 Second ,, ,, = 0-906; rotation +13-8; refractive 



index at 20 = 1-4634. 

 Third ,, ,, ,, = 0-943; rotation not taken; refractive 



index at 20.= 1-4821. 



The saponification number for the esters in the third fraction was 13-3, 

 and for the first fraction 6-3. It is thus evident that a low-boiling ester, perhaps 

 butyl-butyrate, was present in the first fraction. 



The cineol was determined by the resorcinol method in the portion dis- 

 tilling below 193 C. ; when calculated for the crude oil, the result was 40 per 

 cent. By phosphoric acid the cineol hardly exceeded 20 per cent. A consider- 

 able amount of cineol was present in the oil boiling below 170 C. The first 

 fraction was again distilled, when 46 per cent, came over below 159 C. (corr.), and 

 37 per cent, between 157-167 C. These fractions gave the following results : 

 First fraction, sp. gr. at 15 C. = 0-8726 ; rotation a D + 28-9; refractive 



index at 20 = 1-4625. 

 Second ,, ,, 0-8864 ; rotation a u + 24-5; refractive 



index at 20 = 1-4649. 



THE PINENE. The first fraction above was shaken with a solution of 

 50 per cent, resorcinol to remove the cineol. The unarbsorbed oil was washed, 

 dried and redistilled, when practically the whole came over between 156-157 C. 

 (corr.). It had specific gravity at 15 C. = 0-8636; rotation a n + 38'6; and 

 refractive index at 20 = 1-4658. These constants are in close agreement with 

 those for pinene. The nitrosochloride was prepared in the ordinary way and 

 when purified melted at 103-4 C. This result confirms the indications for 

 pinene, which thus had a specific rotation [] + 44-69. 



The oil of this species belongs to the pinene-cineol group, containing a 

 small amount of esters. 



34. Eucalyptus leucoxylon. 



(F.v.M. with E. sideroxylon in Trans. Vic. Inst., I, 33, 1855.) 



White Gum. 



Systematic. A moderately sized tree seldom exceeding 20 to 30 feet, with 

 a smooth bark. Bark deciduous, whilst in young trees it is yellow or reddish in 

 colour. Abnormal leaves ovate to ovate-lanceolate, sessile or shortly petiolate, 

 often glaucous. Normal leaves ovate-lanceolate to narrow lanceolate, often 

 thickish; intramarginal vein removed from the edge; venation oblique, some- 

 times 6 inches long and under \ inch wide. Buds usually two to three each on 



