— 32 — 



young ones ("suckers"); in the former case 0,243 °/ were obtained, 

 in the latter only o,i98°/ . It should also be taken into considera- 

 tion that the material was derived from different districts. In spite 

 of this, the properties and composition of the two oils were on 

 the whole the same, with the exception that the oil obtained from 

 "suckers" was richer in terpenes and consequently of less specific 

 gravity and also more difficult to dissolve. 



Oil from older leaves: di 5 o 0,9117; « D — 8,5°; saponification 

 number 13,1; soluble in 1 vol. 80 per cent, alcohol. 



Oil from leaves of "suckers": di 5 o 0,8889; « D — 10,4°; saponi- 

 fication number 10,25; soluble in 5 vol. 80 per cent, alcohol. 



The crude oils had a red colour, and the odour of aromadendral. 

 The following constituents were detected: cymene, aromadendral, small 

 quantities of pinene and eucalyptol, further geraniol (?) in the form 

 of the acetic ester. Phellandrene was not present. 



7. Oil of Eucalyptus gomphocephala D. C. (Touart or Tooart). The 

 oil obtained in a yield of only 0,031 °/ , had a reddish colour and 

 a rancid disagreeable odour, which reminded little of that of ordinary 

 eucalyptus oils. It consists chiefly of terpenes, among which in 

 abundance phellandrene, and is consequently difficult to dissolve; even 

 with 10 vol. 80 per cent, alcohol no clear solution could be obtained. 

 Cineol could not be detected, but an acetic acid ester was found to 

 be present; d 15 o 0,8759; saponification number 25,74. 



8. Oil of Eucalyptus salubris F. v. M. (Gimlet Gum). The destil- 

 lation gave a yield of 1,391 °/o °^» which in the crude state had an 

 orange to reddish brown colour, and a powerful aromadendral odour. 

 d 15 o 0,902; «£> — 5,8°: saponification number 18,88. In 10 vol. 

 70 per cent, alcohol the oil was insoluble, but it dissolved in 1 vol. 

 80 per cent, alcohol. It is fairly rich in high-boiling constituents, as 

 only 66°/ passed over below 183 . In the fraction passing over 

 above 214 , aromadendral was present in abundant quantity. There 

 were further found in this oil: d-pinene, cymene, eucalyptol (about io°/ ), 

 and esters which probably consisted chiefly of geranyl acetate. 



The comparatively high content of aromadendral of the oil of 

 E. salubris, induced Baker and Smith to once more submit this 

 aldehyde to a thorough study. It was then found, in agreement 

 with previous results 1 ), that it is really a new aldehyde, contrary to 

 the observation which we again made recently 2 ), according to which 

 the aldehyde with a cumin-like odour which we detected in several 

 oils, is identical with cuminic aldehyde. From this it must be con- 

 cluded that two different aldehydes possessing the same odour are 

 present in the various eucalyptus oils, of which one is cuminic aldehyde. 



*) Report April 1901, 33; October 1901, 29. 

 2 ) Report October 1903, 36. 



