GENERA EUCALYPTUS AND MELALEUCA. 



13 



in the dry state giving 31 ounces 2 drachms of oil ; in other respects 

 being a close resemblance to it. The specific gravity of this sample is 

 O907 ; it boils at 320°, the mercury rising to 385°. A comparison of 

 this with the preceding oil suggests the idea that a portion of the volatile 

 contents of the leaves may have been lost by the drying process to which 

 they were subjected. 



Table showing the Solubility of Eesinous Substances, at 

 Ordinary Temperatures, in the Essential Oil op Eucalyptus 

 amygdalina. 





Number 







of ounces 





Name of Resinous 



avoirdupois 



Remarks. 



Substance. 



soluble in 



1 imperial 



pint. 







23-3 



Thin, transparent, almost colour- 

 less ; solution perfectly saturated 

 at about 70° F. 





20-3 



Oily solution. 





175 



Perfect solution, very viscid. 



Victorian Sandarac 



11-6 



Beautiful clear yellow solution, very 



(from the Callitris 





viscid. 



verucosa) 







Elemi 



10-2 



Oily solution. 



Sandarac (ordinary) . 



73 



Fine viscid solution. 



Kaurie Gum (from 



73 



Beautiful clear solution, exceedingly 



New Zealand) 





viscid. This resin dissolves with 

 great readiness in the essential oil. 



Dammar (ordinary) . 



73 



Fine solution, as thick as castor oil. 





5-8 



Perfect solution, almost opaque, and 

 very thick. 



Grass-tree Gum (from 



5-2 



This resin is not completely soluble 



Victoria) 





in amygdalina ; to obtain a satu- 

 rated solution, it must be used 

 greatly in excess. The solution is 

 oily, and of a beautiful transparent 

 red colour. 



Dragon's blood . . . 



4-3 



Beautiful solution, obtained by using 

 a moderate excess of the resin . 





2-8 



A portion only soluble ; the concen- 

 trated solution is obtained by 

 treating a large excess ; yellowish 

 oily liquid, very clear. 



Copal (Sample No. 1) 



1-94 



Clear, viscid, colourless solution, 



Ditto (Sample No. 2) 



1-33 



some samples more soluble than 

 others ; in all cases, a few clear 

 gelatinous particles sink to the 

 bottom, and remain undissolved 

 even on dilution. The solution 

 takes place very rapidly. 



