AND THEIR ESSENTIAL OILS. 197 



ary odour of })e})i)erinint, due to the presence of a sinall 

 amount of piperitone, and eucalyptol could also be readily 

 detected. The principal constituent in the oil of this 

 species is })hellandrene, and pinene is probably absent. 

 Eudesmol was present in some quantity, the high boiling 

 fraction becoming solid in the bottle after a few hours. 

 Only a very small amount of ester was determined. 

 Although the phellandrene shows the laevo-rotatory modifi- 

 cation to be in excess, yet, jurlging from the comparatively 

 small rotation, and the almost entire absence of pinene, 

 it is possible that the phellandrene of opposite rotation 

 may be present also. So far dextro-rotatory phellandrene 

 has not been isolated from Eucalyptus oil. The crude oil 

 had specific gravity at IS*^ C. = 08883 ; rotation 

 hd = -20-90; refractive index at 180 = 1-4819 ; and was 

 soluble in 3 volumes 80 per cent, alcohol. This compara- 

 tively ready solubility is due to the eucalyptol and the 

 eudesmol. 



On rectification, the usual amount of acid water 

 and volatile aldehydes were obtained below 173° C. 

 (corr.) ; the aldehydes, however, were much less 

 pungent and objectionable than those from the 

 oils of the pinene-eucalyptol group. Between 173-198° C. 

 78 per cent, distilled; the temperature then rose 

 quickly to 265°^ only 1 c.c. distilling; between 

 265-282° 17 per cent, distilled. These fractions gave the 

 following results: — 



Sp. Gr. at T, * *• Ref- Index 



15° C. Rotational,. at 23° C. 



First traction 0-8713 ... -29-5° ... 1-4782 



Second tr-dction 



(2H5-282°) 0-9421 ... — ... 1-5048 



The eucalyptol was determined in the first fraction by the 

 resorcinol method and calculated for the crude pil, which 

 was thus shown to contain 21 per cent, of that constituent. 

 The saj^onification number of the ester and free acid was 

 only 3*3. The oil of this species has a strong resemblance 

 to that of the E. rnujdin originally investigated at this 

 museum, and i^^corded in the " Research on the Eucd- 

 lypts " (p. 194). The large amount of eudesmol causes 

 the high boilinsf fraction to soon become solid ; and this 

 appears to be a distinguishing feature with the oil of 

 E . vir(fatii, because the oil of E. Sieheriana did not con- 

 tain eudesmol in the samples tested. The presence of the 

 eucalyptol in the oil of E. virgata also distinguishes it 

 from that of E . Sieheriana. 



