% 



494 



PRODUCTION OF 



Sect. XVII. 3. 4. 



- 



found In wheat flour, when the mucilage and ftarch are wafhed from 

 it, might be worth inquiry, as mentioned in Sea. VI. 8. 5. 



4. Other barks contain bitter, refinous, aromatic, or acrid materials, 

 which fupply the (hops of medicine, as peruvlan bark, cafcarllla] 



cinnamon, and were defigned by nature to proted thofe vegetables from 



the depredations of quadruped 



feds 



Hence many 



and 



the wood of them, after it is dried, and made into domeftic fu 



niture, 

 prefs ; 



and h 



devoured by 

 many pi 



as th 



the mahogany, cedar, cy 

 foxglove, digitalis, hounds 



o 



cynoglofTum, henbane, hyofciamus, and many 



devoured by any animal 



as 



them 



their j 



would be poifonous to 



or 



the nofe or palate did not prevent their eatino- tli^em 



much difagree with their flomachs, if their difguftful fla- 



.^ .„^ — j^«....w V4*« iiwi. |Jn.v^.^lL Liicii cciinjg [iiem. The 



fame defence of the vegetable kingdom from human digeftion, except 



fe which have in long procefs of time been feleded and cultivat- 



appcars from the relation of fome unfortunate fhipwrecked tra- 



pafTed fome hundred of miles along uninhabited 



ed 



wh 



h 



moft without finding an efculent vegetable produdio 



5. Other barks contain reftringent or colouring particles, employed 

 the arts of dying and tanning, as berberry, oak, and afh 



ries, q 



frax 



The art of tanning confifts in 



fillino: 



o 



berber 



th. 



pores of the animal mucous membrane with thefc reftrino-ent 



par 



found in fome vegetables, which are believed to poITefs a qua 



ty of (hortenino; animal fibres 



ed fome time in a fol 



Thus when a long hair is immerf 



of the bark of oalc 



f the g 



pro 



duced on its leaves by the pundures of infers, the hair is faid to be 



fhortened 



of the muc 



Whether this procefs be occafioned by chemical 



of which thefe fibres totally or in part confifl: 



by capillary attraaion tending to diflend thefe fibi 



d thus to £h 



them 



in breadth 



as 



has not yet been well inveftio-ated 



wifted firing is fhortened by moif- 



pores of anim 



7 



Ik 



with 



By thus impregnating th 



getable particles, they become lefs 



liable 



