GENERA EUCALYPTUS AND MELALEUCA. 



19 



tree yields 8 ounces of oil. Its solvent properties, with a selection of 

 resinous bodies, will be found noted in tbe subjoined table : 



Table showing the solubility of Resinous Substances at 

 Ordinary Temperatures, in Essential Oil of Eucalyptus 

 fabrorum. 





Number 







of ounces 





Name of Resinous 



avoirdupois 



Remarks. 



Substance. 



soluble in 





1 imperial 







pint. 







21-8 



A perfectly saturated solution, thin 

 and clear ; temperature about 70°. 





16-4 



Pale yellow soluti on, clear andbright, 

 of tbe consistence of oil. 



Sandarac (ordinary) . 



10-9 



Rather more viscid than preceding. 



Kaurie Gum (from 



10-2 



Beautiful transparent solution, ex- 



New Zealand) 





ceedingly viscid. 





7-6 



This resin is totally soluble in the 

 essential oil of E.Jabrorum, pro- 

 ducing a liquid of a deep red 

 colour, almost black. 





1-09 



Golden yellow solution, a portion 

 only of the resin being soluble 

 (about 75 per cent.), the insoluble 

 being much swelled and gelati- 

 nized. 



Shell-lac ...... 



0-98 



Dark amber-coloured liquid, only 

 obtained when a large excess of 

 the resin is employed. The undis- 

 solved portion softens and agluti- 

 nates together, adhering fast to 

 the sides of the vessel used for the 

 digestion. 



Copal (sample No. 2) . 



0-76 



This resin behaves as anime does ; 

 about 50 per cent, is soluble in 

 the volatile oil. 



Gutta Percha . . . 



o-o 



No solvent action. 



Eucalyptus Jissilis (Messmate). — This oil bears a strong resemblance 

 to the preceding ; its yield is the same — viz., 8 ounces from 100 lbs. of 

 leaves. Its colour is a pale reddish yellow, and its smell is mild and 

 rather agreeable, like fabrorum. In taste it is also very similar, attack- 

 ing the throat. Its specific gravity is - 903 at 60° F., and it boils at 350°, 

 the temperature rising until it reaches 386°. 



The essential oil of E. Jissilis is a good solvent for resins, but no 

 exact quantative determinations have been made with it. The messmate 

 tree occurs under the same conditions as stringybark. 



Eucalyptus odorata (Peppermint). — The peppermint tree extends from 



b 2 



