" Strliiijijbark" Eacalypts. 



181 



Fi-. II. 



loO'c J 160 170 I j ISO 190 



Pinene. Phellandrene. Eiicalyptol. 



200 



210 



220 



230 



2-40 



Mu = JB. MuellericDia : C 



Aromadendial. 

 C ir., Cm. = -&'. Consi'JeniiUia. 



The distillation curves ol)tained for three of the oils examined 

 are jriven in Fig. II., and will lie seen to fall between those of the 

 two classes of striugybark oils shown in Fig. I. There is undoubtedly 

 a wide variation here, as well as in the optical rotation, partially, 

 though not quite, bridging the gap between this species and others 

 closely related. 



It will be of interest to compare this variation of chemical charac- 

 teristics with that shown by the carpels so largely used by mor- 

 phologists as a basis for the classification of the eucalypts. 



Of the carpels figured in Plate X., No. I. was forwarded to one 

 of us by Mr. J. H. Maiden, as a type of the species occurring near 

 Metung, Gippsland ; it can be almost exactly matched by a carpel 

 of E. Siehtriana: Nos. 2-9 were all collected from one single tree, 

 that growing at Eltham, and from which oils la. and lb. were dis- 

 tilled, and they also have been matched by carpels from eight different 

 species as indicated. No. 10 grew on a Lilydale tree and the divergence 

 exhibited in the chemical composition of the oil is seen to be more 

 pronounced in the shape and size of the carpel, which clo.sely resembles 

 that of E. mdcrorhi/ncha. 



Such a wide variation as we have found is not indicated in J. H. 

 Maiden's description of the species, nor in the accurate and detailed 

 field notes of Dr. Howitt, where he pictures the Yertchuk as he saw 

 it in (lippsland. It may be noted that the latter describes the timber 



