428 



for the leaves which are reproduced from lopped old trees, and the oil from the 

 seven months' " suckers " contained more cineol and less pinene than did that 

 from twelve months' old seedlings, while that from the fifteen months' old 

 " suckers " followed the same rule in respect to the two and a half years' old 

 seedlings. It will be seen that the constants followed this change in constituents 

 somewhat regularly. To a small extent these were governed by the length of 

 time to which the leaves had been distilled, as naturally the heavier constituents 

 were brought over with more difficulty. The factors which are influenced to the 

 greatest extent appear to be the specific gravity and refractive index, and this 

 was shown with (e), where the idea was to obtain, by longer distillation, as much 

 of the crystallised eudesmol as possible. With (/) and g derived from general 

 material commercially distilled, the oils were quite in agreement with those we 

 obtained when this species was first investigated many years ago, which results 

 are recorded under E. Smithii in this work. Thus the relative constancy with 

 the oil of individual species is again shown. 



OILS OF EUCALYPTUS PUNCTATA. 



(Material collected at Canterbury and Belmore, localities a few miles from Sydney.) 



In May and June, 1897, a somewhat similar investigation had been 

 undertaken, in order to determine what variations were likely to occur in the 

 character of the oils derived from trees of a species belonging to the " Gum" 

 group of Eucalypts. The oils from the species of this group often contain the 

 aldehyde aromadendral as a characteristic constituent, and it is present in that 

 of this species. 



1. Leaves and branchlets from a tree of fair size. 



2. Leaves and branchlets from a large tree. 



3. " Sucker " or abnormal leaves. 



4. Leaves and branchlets from a large tree. 



5. General material from old trees. 



6. Leaves and branchlets from young trees 20 to 30 feet high. 



7. General material from trees of medium size. 



8. Leaves and branchlets from one tree of medium size. 



9. Leaves and branchlets from a large tree, the material being divided 



into two parts and distilled separately. 

 10. Equal volumes of the above oils mixed together. 

 Crude oils from the above material (1377 lb.) gave the following results : 



