\ 



XVi, 



3m. 



¥ 



a^ed 



id 



oin 



y trees. 



) 





and 



omeftic fa. 



cedar 



I 



r 



J cy. 



'^^^^> are not 



• ^ 



poilonous to 



them, ae 



ftion, except 

 and cult'i^di- 

 recked tra- 



uninhabited 



\ T 



r 



Droduclion. 

 /, employed 

 afh, Berber- 



a 



filling the 



Iringent par- 

 poffefs a qua- 

 il- is infimerf- 



-nc galls pro- 

 \ is faW ^0 ^' 



ical coag'J' 



:mi 



1 



part 



coil 



» 



m 



brea 



) 



nc 



dby 



moil' 



:.cr tlis 



j-egnati^o 



, beco^t 



Sect. XVII. 3. 6. ROOTS AND BARKS. 495 



liable to putrefa£lion, as confifling of a mixture of animal and vege- 

 table matter, as well as much better adapted to many domeftic or me- 



nu rpofes 



Th 



f dying confifts likewife in impre 



the pores of 



dry lubftances with a folution of the colouring matter extra(5led from 



bles by the capillary attraction of thofe pores 



th 



coloured 



And fecondly, bv a chemical change of thofe colouring 



d the water of the fol 



folution. 



particles after they have been imbibed 



exhaled, by again fteeping them in another folution, which may 



chemically afFeft the former. Thus as green confifts of a mixture of 



blue and yellow, it may be beft produced by boiling the material de- 



iigned to be dyed firft in a deco£lion of one of thefe colours, as of in- 



d 



£3 



d then in that of anoth 



of the bark of berberry 



And 



as 9 folution of iron becomes black when mixed with a decotflion of 

 oak-galls, by being in part precipitated ; it is probable, that the par- 

 ticles of this combination of a folution of iron with reflringent matter 

 may be larger than either of thofe particles fcparately ; and there- 

 fore that, if a dry porous fubftance be immerfed firft in a decoflion 

 of oak-galls, and after being fuffered to dry, is then immerfed in a 

 folution of iron, the black tinge will penetrate into minuter pores, 

 and thus become more intenfe, than if the fubftance had been im- 



fed in the black dye already prepared 



6 



Oth 



bark 



are 



fed fo 



pparel, paper, corda 



d for 



many mechanical pujpofes, owing to the ftrength and tenacity of 



their fib 



or to the finenefs of th 



as hemp, cannabis 



fl 



ax 



> 



linum J for the purpofes of fpinning and weaving ; an art invented by 

 Ifis, queen of Egypt, who feems firft to have cultivated flax ; which 

 was brought into Europe from the banks of the Nile. The bark or 

 leaves of the papyrus, a flag of the Nile, was firft ufed for paper ; and 



r 



the bark of the mulberry-tree is ftiU made into cloth at Otaheite and 

 other fouthcrn iflands. 



The art of feparating the fibres of the bark of plants/as they con- 



fift 



