470 



The late Rev. Dr. Wools named specimens of what is 

 now E. rubida for one of us as E. diver si folia — a very good 

 name for the tree — specimens of which Bentham may have 

 had when identifying E. diver si folia of Bonpland. Unfor- 

 tunately, no one seems to have described the "sucker" or 

 abnormal leaves of E . santali folia, or, for the matter of that, 

 E . diver si folia, so that it is difficult to understand how the 

 latter name applies to Mueller's tree, as the leaves are not 

 diverse. 



Maiden, in his "Critical Revision of the Eucalypts," 

 Part iii., reproduces in full Bonpland's description of E. 

 diver si folia, but unaccompanied by Massa's plate. 



The' more experience we have with Eucalypts the more 

 the fact is impressed upon us that it is more often .than 

 not almost impossible to identify Eucalyptus trees or material 

 from descriptions alone, and this is the difficulty with 

 Bonpland's description. In this connection it brings to mind 

 the words of Caley in "Flinders' Voyages," vol. ii., p. 547, 

 under "Eucalyptus" : — "Fifty species of Eucalyptus, most 

 of which are distinguished and have proper names applied to 

 them by the native inhabitants, who, from differences in 

 colour, texture, and scaling of the bark, and in the ramifica- 

 tion and general appearance of these trees, more readily 

 distinguish them than botanists have as yet been able to do." 



Of the identity of E. santaliiolia, as now established, 

 there can be no doubt, and as the chemical data are made 

 on that species there is no other alternative but to retain that 

 name for the result of this investigation. 



Essential (Jil . 



Leaves and terminal branchlets of this species for distil- 

 lation were collected at the Kingscote end of Kangaroo 

 Island in the month of June. 



The average yield of oil was 0'41 per cent. The 

 crude oil was of a lemon-yellow colour and had a terpene-like 

 odour, which almost entirely masked that of the small amount 

 of cineol. Although chiefly a terpene oil, and highly laevo- 

 rotatory, yet phellandrene was absent. The oil also contained 

 nearly 20 per cent, of sesquiterpenes. The crude oil had 

 specific gravity at 15° C. =0*884; rotation a D — 37'7° ; refrac- 

 tive index at 20° = 1*4736, and required 8 volumes 80 per 

 cent, alcohol to form a clear solution. 



The saponification number for the esters and free acids 

 was 4'9. 



On rectification a few drops of acid water came over, 

 but the volatile aldehydes were present only in very small 

 amount. Between 168-175° (corr.), 38 per cent, distilled; 



