GENERA EUCALYPTUS AND MELALEUCA. 



17 



Table showing the solubility op Kesinous Substances at 

 ordinary temperatures, in Essential Oil op Eucalyptus globulus. 



Name of Resinous 

 Substance. 



Camphor 

 Mastic . 



Kaurie Gum (from New 

 Zealand) 



Sandarac (ordinary) . 



Grass-tree 



Asphalt 



Copal (sample No. 2) . 



Anime 



Shell-lac 



Gutta Percha 



Number 



of ounces 



avoirdupois 



soluble in 



1 imperial 



pint. 



14-5 

 127 



8-0 



73 



6-5 



6-5 

 1-02 



0-81 



013 



o-o 



Remarks. 



Thin solution, perfectly saturated at 

 about 70° F. 



Fine solution, easily effected, of the 

 consistency of honey. 



This resin dissolves with great readi- 

 ness ; the solution is very viscid, 

 flowing with difficulty. 



Oily solution. This resin is taken up 

 more slowly than the preceding. 



This gum completely dissolves, giv- 

 ing a deep red viscid liquid, almost 

 opaque. 



A thick opaque solution. It is very 

 probable that the oil would take 

 a greater quantity than that here 

 given, but it is not possible to see 

 when the asphalt ceases to dissolve. 



The resin in this case must be used 

 in excess. The soluble part of it 

 gives, with the oil, a perfectly 

 colourless oily solution. By con- 

 tinued digestion for several weeks, 

 so considerable a portion of the 

 gelatinized residue is taken up, 

 beyond the amount given in the 

 table, as to make E. globulus ap- 

 pears to be the best solvent of copal. 



This resin behaves in a manner some- 

 what resembling that just described 

 save that the gelatinized insoluble 

 portion retains its pulverulent 

 form, although very much swelled 

 and softened. About 55 per cent, 

 of anime is dissolved in this vola- 

 tile oil. 

 Pale, bright, amber-coloured solu- 

 tion, very thin ; it can only be 

 obtained by digesting a large excess 

 of the finely-powdered resin. 



No solvent action. 



Eucalyptus corymbosa (Bloodwood). — The leaves from which this 

 sample of essential oil was produced had suffered decay to even a 



VOL. III. b 



