i 



/ 



I 



» 2 



»3i 



t 



are 

 in? ; 



anan 



S inad. 



leir 



I 



Water i 

 5urfts tb 



fucculei 



s 



IS 



c 



n 



he 



ho^c parts 

 vifies, arc 



li tr::s of 



)CCUpvina 



Th' 



decid 







ere IS 



UOliS 



le winter^ 



r balfamic 



£led from 

 what is 



]S 



nding the 

 t exfudes. 



from nno- 



J owes its 

 erebintbi- 

 has been 



:ied fron^^ 

 jations 



o: 



n 



fen 



ferf 



faie^^^ 



Sect. VI. 8. 4.5' 



SECRETIONS. 



fraelU when tbefe efTeahal oils are dilTolved 



mixed with water in 



/ 



diftillation, they have been called the fpiritus redor of the plant, and 

 conftitute the odour of it, whether aromatic or fetid 



Some of thefe elTential oils poffefs the moft poifonous qu 

 thofe of lauro-cerafus^and of tobacc 



as 



and are ufed by Ind 



for the purpofe of poifoning their weapons, which they cover hke 

 varniftl. And hence fome of the refinous woods are fa.d never to^ b 



devoured by infed 



the unperiihable chefts of cyprefs, in 



hich 

 and 



Ec^yptian mummies have been preferved for fo many 

 the cedar in which black lead is inclofed for pencils. ^ 



The acrid poifon of the large euphorbium of Africa exifts m the oil 

 of that plant : as M. Vaillant obferves, that the natives fometimes poi- 



fon the waters with aicing this plant into them, and that the poifon 



Gus oil fwims upon the furface, and may thus be avoided by 



ful drinker. This in a country where water is fcarce, and generally 



ftacTiiant pools, may be readily efFeded 



few fpoonfuls of oil will 



large fheet of w 



as 



it becomes diffufed upon it without 



fridion 



XXIX 



mentioned, in Bot 



Garden, Vol. I. Addit 



Note 



4 



Some of the effential oils are fo inflammabl 



vehement flame on being mixed with nitrous acid, as 



burft 

 I ofc 



and even 

 fraxinella will tak 

 lighted candle 



the fmall quantity difFufed in the air round the didamnus 



fi 



on a 



ilill 



evening at the approach of 



5. With thefe ihould be arranged the elaftic relln called Caoutch 

 which is faid toexfude from a tree in Guaiana, called latropha elaft 



Cp 



A fimilar elaftic refin 



by M. de la Borde, phyfician at Cay 

 faid to be obtained from a. plant in Madagafcar, called 

 kind of wild fig-tree, according to Abbe Roch 

 extraded from the bark of the hoUie 



F 



o 



and the bird-lime 



f our climate feems to be 



iimilar m 



like the caoutchouc it becomes foft. by heat, a!\d 



impenetrable by water, but foluble in ether 



Another elaflic fub 



{I 



