104 R. T. BAKER AND H. G. SMITH. 



On the " STRINGYBARK " TREES of N. S. WALES, 

 Especially in regard to their ESSENTIAL OILS. 



By R. T. Baker, f.l.s., Curator, and H. G. Smith, f.c.s., 

 Technological Museum, Sydney. 



[Read before the Royal Society of N. S. Wales, July 6, 1898.'] 



Part I. 



Contents. 



1. Introductory. 



2. Botany of the Species. 



3. Chemistry of the Oils. 



4. Summary of Results. 



1. Introductory. 

 This, the third paper read by us before this Society on the trees 

 of the genus Eucalyptus and their essential oils, includes three 

 species instead of one, as in previous papers, and sufficient 

 botanical details are given to clearly establish the identity of the 

 material employed in the research. The chemical results we 

 regard as of some importance at the present. time in view of the 

 appearance of the new edition of the British Pharmacopseia just 

 issued (1898). 



2. Botany of the Species. 

 The trees to which the name " Stringybark " is applied in this 

 Colony and which will be included in this, and Part II., of our 

 Stringybark paper, are as follows : — E. obliqua, L'Her., E. 

 Baileyana, F.v.M.; E. macrorhyncha, F.v.M.; E. capitellata, Sm.; 

 E. eugenioides, Sieb.; E. fastigata, Deane and Maiden. 



E. piperita, Link, might perhaps be placed in this list as well 

 as E. trianiha, Link, but our researches in connection with these 

 latter species are not yet complete. 



Of this list the best known " Stringybarks " are : — E. macro- 

 rhyncha, F.v.M., E. capitellata, Sm., and E. eugenioides, Sieb.; 



