HESIKOUS SEOnr.TIONS. 



much more various in different plant -, thnri 

 the preceding, as the Turpentine of the Fir 

 and Juniper, the Red Guiti of New 3outh 

 Wales, produced by one or more species of 

 Eucahipiun, BoL of I^.IIolL f, 13, and the 

 fragrant Yellow Gum of the same country, 

 see IVliitts Voyage, 23,5, which exudes spon- 

 taneously from the Xanthorrhcca Hastile. 

 Most vegetable exudations partake of a na*' 

 ture between these two, being partly soluble 

 in water, partly in spirits, and are therefore 

 called Gum-resins. The milky juice of the 

 Fig, Spurge, <Scc., which Dr. Darwin has 

 shown, and which every body may see, to be 

 quite distinct from the sap, is, like animal 

 milk, an emulsmi, or combination- of a wa-» 

 tery fluid with oil or resin. Accordingly, 

 when suffered to evaporate irt the air, such 

 fluids become renins- or gum-resins, as the Gum 

 Euphorbimn. In the Celandine, Ckelidoni^ 

 um mnjiis, Engl. Bat. t. 1581, and st>mc 

 plants allied to it, the emulsion is orange-co^ 

 loured. 



The more refined and volatile secretions of 

 a resinous nature are called Essential Oils, 

 and are often highly aromatic and odoriferous. 



