112 E. T. BAKER AND H. G. SMITH. 



the case with eucalyptus oils. This is no doubt accounted for by 

 the presence of such a large percentage of eudesmol, as the 

 eucalyptol was found to have the usual boiling point. We have 

 acquired data of much scientific interest bearing upon this subject, 

 but further researches have to be undertaken before the results 

 can be published. We hope eventually, however, to be able to 

 account satisfactorily for the physical differences and varied com- 

 position of these oils. It is found that the chemical constitution 

 of the many substances found existing in the Eucalypts is very 

 different in character, although it appears that those having similar 

 constituents form distinct chemical groups. 



Oil of IS. capitellata. 

 In the determination of the oil from this species the methods 

 previously described were followed. The leaves were obtained in 

 the neighbourhood of Sydney, and were distilled almost as soon 

 as collected. 



Oil from leaves collected at Canterbury, distilled 9th and 10th 

 August 1897 ; red in colour, rather dark ; yield 0*103 per cent, 

 (mean of four distillations on 807 lbs. leaves), or 100 lbs. of leaves 

 with branchlets gave nearly one and three-quarter ounces of oil ; 

 specific gravity, crude =09153 at 18° C. The oil was too dark 

 in colour to enable the rotation to be taken. On redistillation of 

 100 cc. the usual water was obtained at about 100°, this was acid; 

 below 152° only a few drops had come over, by 169 5° 3 per cent, 

 had distilled, at 170-4° distillation commenced. (See tabulated 

 results.) 



First fraction 22%; sp. gr. = 0-893 ; specific rotation + 7*28° 

 Second „ 44%; „ =0-8992; „ +3-5° 



Third „ 7%; „ =0-912 



Fourth „ 17%; „ =0-946 

 Eucalyptol second fraction =38*4% 



Although the appearance of the several fractions, the results of 

 distillation etc., somewhat resembled the oil from JS. macrorliyncha^ 

 yet the fourth fraction having the high boiling constituents con- 

 tains only a very small quantity, if any, of eudesmol, and we hope 



