BOTANICAL AND CHEMICAL CHARACTERS OF THE EUCALYPTS. 203 



The oil from this species of Eucalyptus belongs to the cineol-pinene 

 group and the leaf has a venation of type 2. The oil contains cineol 

 in larger amount, perhaps, than is found in that of any other species 

 and has a less percentage amount of the constituents which are 

 generally considered of an objectionable nature, as, for instance, the 

 aldehydes, sesquiterpenes, &c. 



The following tahles illustrate the rate of diminution of the terpene 

 and the corresponding increase in cineol as the trees grow older ; but 

 it may be observed thot the figures published fourteen years ago for 

 the oil of this species agi'ee most closely with those now given for 

 general material, although the foliage was collected over a hundred 

 miles from the locality where the later material was gathered. 



Extended data as well as numerous illustrations are given in the 

 'Journal of the Royal Society of New South Wales,' August 1915. 



Table I. 



(a) Leaves from lopped trees, seven months' growth; collected May 



1913. 



(b) Leaves from lopped trees, fifteen months' growth; collected May 



1913. 



(c) Leaves from seedlings, twelve months' growth; collected June 



1914. 

 (J) Leaves from seedlings two and a half years old; collected July 



1914. 

 (e) Leaves from cultivated tree at Marrickville ; collected June 1915. 

 (/) Leaves from general material, partly young; collected January 1915. 

 (^g) Leaves from general material; collected three weeks later than (/). 

 (kj Leaves from old trees; collected March 1913. 



Tlue constants, &c., given by the crude oils from the above material 

 were as follow: — 



Table IL 



