•OTANICAL AND CHEMICAL CHARACTERg OP EUCALYPTS. 97 



The Botanical and Chemical Characters of the Eucalypts and 

 their Correlation. — First Report of the Committee, consist- 

 ing 0/ Professor H. E. Armstrong (Chairman), Mr. H. G. 

 Smith {Secretary), Mr. E. C. Andrews, Mr. R. T. Baker, 

 Professor F. O. Bower, Mr. R. H. Cambage, Professors 

 A. J. EwART and C. E. Fawsitt, Dr. Heber Green, Dr. 

 CuTHBERT Hall, Professors Orme Masson, E. H. Rennie, 

 and R. Robinson, and Mr. P. R. H. St. John. 



[Plates V. and VI.] 



The Committee was appointed at the Australian Meeting in 1914; 

 during the year, Mr. J. H. Maiden has resigned and Professor A. J. 

 Evvart has been made a member; three meetings have been held in 

 Sydney. 



The Eucalypts cannot be completely classified according to any one 

 (botanical) character and, at present, the chemical and the botanical 

 characters cannot all be taken into account with sufi&cient precision to 

 warrant the submission of a classification of the species in the order 

 of their evolution. 



The Committee only feel justified in drawing attention to the follow- 

 ing conclusions on specific points which may be considered to be well 

 established : — 



(1) Three types of venation are met with in the mature lanceolate 

 leaves of the Eucalypts ; each of these types appears to be 

 characterised by a definite type of anther in the flower, by special 

 oils in the leaves and by specific substances in the kino from the 

 tree. 



(2) The amount of inorganic material present in the wood of the 

 Eucalypts is exti'emely small in the case of the species which 

 grow to the greatest size. 



(3) The evolution of the Eucalypts has been accompanied by a 

 marked evolution in the Cotyledons. 



(4) Chemical as well as botanical evidence shows that the Eucalypts 

 are closely related to the Angophoras. 



The Botanical and Chemical Characters of the Eucalypts and their 

 Correlation. By R. T. Bakeb and H. G. Smith. 



The genus Eucalyptus is of great importance in Australia, as it 

 embraces perhaps about two-thirds of the vegetation of the continent; 

 whilst the characteristic botanical features are representative of the 

 whole genus, there are distinct minor differences which justify pro- 

 nounced differentiation in not a few directions. During recent years 

 the botanical and chemical characters of many species have been deter- 

 mined. It appears that, not only are certain botanical features peculiar 



1915. ■ H 



