BY CUTFIRKRT HALL. 749 



were E. crehra, E. eugenioides, E. hemlphloia, E. i->nnctata^ and 

 E. tereticornis . I have named this form or species, tentatively, 

 E. Marsdeni, after the Rev. Samuel Marsden, the first incumbent 

 of St. John's Church, Parramatta. 



Oil. — Mr. H. G. Smith reports tliat the oil of this Eucalyptus 

 was obtained by steam-distillation, in the ordinary way, from the 

 leaves and terminal branches. It was somewhat thick and vis- 

 cous, having almost the viscosity of castor oil. It has little 

 resemblance, either in appearance or constitution, to the majority 

 of ordinary Eucalyptus oils, but is more closely allied to the oils 

 distilled from E. nova-anylica and a few others. It has no re- 

 semblance to the oils of the members of the E. tereticm^nis-gvow^. 

 Cineol was practically absent, and phellandrene could not be 

 detected. The amount of oil available did not permit of the 

 active terpene being isolated in a pure condition, but it is pro- 

 bable that dextro-rotatory pinene occurs in small amount. 



Only 38 pounds of material were received for distillation, from 

 which 4 ounces of oil were collected, equal to 0'66 percent. The 

 oil was but little coloured, and had a fairly pleasant odour. It 

 gave the following results: — 



Specific gravity at 15°C. = 0"9469. 



Rotation aD = +4-8°. 



Refractive index at •20°C. = 1-4989. 



Insoluble in 10 volumes 80 per cent alcohol at 16°C. 



Saponification number of esters and free acid = 2, so that 

 esters were practically absent. The small amount of free acid 

 was removed, and this gave a strong odour of butyric acid. 

 The phenol gave the reactions for Tasmanol, but it is probable 

 that both phenols occur. The indications are that the oil con- 

 sists largely of sesquiterpenes. Probably some high-boiling 

 alcohols are also present, as indicated by the odour. 



I have to record my sincere thanks to Messrs. R. T. Baker 

 and H. G. Smith for much help in preparing this paper. 



EXPLANATION OF PLATE LXXV. 

 Portion of branchlet of Emalyptns Marsdeni, f. \el sp.n. 



59 



