88 H. G. SMITH. 



standard as fixed. The oils from these two consignments of E. 

 Smithii were identical in all constituents, equally rich in eucalyptol 

 and the specific gravity, optical rotation, &c, were practically the 

 same in both. Phellandrene was of course absent. 



The oil of a species of eucalyptus, locally known as " Sallow " 

 or " Swamp Gum " and named by my colleague (Mr. Baker) 

 Eucalyptus camphora (loc. cit.), was rich in eudesmol at the time 

 of year when the leaves were obtained, (2nd September 1898). 

 On redistillation of the crude oil a fraction was obtained, repre^- 

 senting 18 per cent., boiling between 280° and 290° C, which in 

 less than one hour had solidified into a solid crystalline mass in 

 the bottle, and which after nine months remains unaltered. The 

 first fraction of this oil contained at that time 33 per cent, of 

 eucalyptol and a large percentage of the pinenes, but had less than 

 1° of rotation to the right in a 100 mm. tube. Phellandrene was 

 absent. 



Besides the species enumerated above, eudesmol has been found 

 by us in the oils of several other Eucalypts that were rich in 

 eucalyptol at the time of distillation, as E. striata, E. elceophora, 

 etc., but, so far eudesmol has not been found in the oil of any species 

 in which eucalyptol is absent, or only present in traces, as E. dives, 

 E. radiata, E. dextropinea, E. microcorys, E. Icevopinea, E. 

 Dawsonii, and many others, and it has not been found to be 

 present in any oil without a fair percentage of eucalyptol being 

 present also. 



Having considered the oils of those species of eucalyptus found 

 to be rich in eucalyptol, containing eudesmol, and in which 

 phellandrene is absent; we turn to those oils in which phellandrene 

 is present at certain times of the year, and which also contain 

 eucalyptol and nearly always eudesmol. 



The oil of the "Red Stringy bark" Eucalyptus macrorhyncha, 

 when first distilled appears always to contain eudesmol, but in 

 greater abundance at certain times of the year. Eucalyptol is 

 always present ; phellandrene can usually be detected ; and when 

 the oil is most abundant in the leaf Isevopinene is present also. 



