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



eugenioides, and we were at first inclined to attribute this character 

 to a much thickened cuticle, but microscopical transverse sections 

 show that the epidermis has no such thickening, but resembles 

 that of E. punctata (loc. cit.). The palisade layers, spongy tissue, 

 vascular bundles, however, differ from those of E. punctata in that 

 they contain a very much larger quantity of what appears to be 

 chlorophyll. In the case of the " Red Stringybark," (E. rnacro- 

 hynclia) it is principally myrticolorin. It is the presence of these 

 bodies and not the thickened cuticularised external wall that gives 

 the leaves the leathery opaque character. 



3. Chemistry of the Oils. 



Oil of E. macrorJiyncha. 



In the investigation of the oils obtained from the leaves of this 

 species of Eucalyptus, the methods followed were those adopted 

 in the research on the oil of E. punctata, 1 and although this 

 investigation is not as complete as we could have desired, yet, we 

 are able to decide that the same differences exist in the physical 

 behaviour of the oils from E. macrorJiyncha, as those found in the 

 case of E. punctata. We had not the same facility for arriving 

 at results from material obtained from individual trees or of trees 

 of varying ages, as was previously done with E punctata, since 

 the Red Stringybark does not grow in the neighbourhood of 

 Sydney, but we obtained material at different times of the year 

 and from two localities, namely Ilford and Rylstone (N.S.W.). 

 The leaves were distilled as soon as possible after removal from 

 the trees, only two or three days elapsing between the dates of 

 collection and distillation. The oils were reddish in colour in all 

 instances. 



No. 1. Oil from leaves collected at Ilford, distilled 25th March 



1898. 



The oil was light reddish-brown in colour, odour pleasant ; yield 



0*312 per cent. 100 lbs. of the leaves and branchlets yielding five 



ounces of oil ; specific gravity as obtained 0*924 at 22° C. The 



1 Proc. Roy. Soc. N.S.W. 1897, 259. 



