RESINOUS SECRETIONS. 71 



Resin is a substance soluble in spirits, and 

 much more various in different plants than 

 the preceding, as the Turpentine of the Fir 

 and Juniper, the Red Gum of New South 

 Wales, produced by one or more species of 

 Eucalyptus, Bot. of N. Holl t. 13, and the 

 fragrant Yellow Gum of the same country, 

 see White s Voyage, 235, which exudes spon- 

 taneously from the Xanthorrlwa Hast He, 

 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, &c, which Dr. Darwin has 

 shown, and which every body may see, to be 

 quite distinct from the sap, is, like animal 

 milk, an emulsion, or combination of a wa- 

 tery fluid with oil or resin. Accordingly, 

 when suffered to evaporate in the air, such 

 fluids become resins or gum-resins, as the Gum 

 Euphorbium. In the Celandine, Chelidoni* 

 um majus, Engl. Bot. t. 1581, and some 

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

 Joured. 



The more refined and volatile secretions of 

 a resinous nature are called Essential Oils, 



