IA.6 On several iiidigetmis Plants which may 



decoctions or infusions transparent, and to make the colours 

 disappear, by pouring into theni^ drop by drop, a sutficient 

 quantity of oil of vitriol. 



The properties of these plants being thus sufficiently as- 

 certained, and there being the greatest plenty of them in 

 the country, it remains now for the connoisseurs to extend 

 the use of them, and to apply them further to the advantage 

 of our national manufactures. 



A List of the Plauts that have leen used in the Experiments 

 on Tanning. 



The number of plants fit for tanning is much greater thaii 

 that of those in the following list ; and it has been observed 

 that, if ihevbe gathered at proper seasons, they can be used 

 for the preparing of all sorts of skins, both coarse and fine. 

 The best of them are such as have the greatest quantity of 

 a coarse, astringent, and acid substance. They are also 

 the fitter for pe-Iietrating the skins, in proportion as they 

 contain a greater portion of aromatic and spirituous parts, 



• and are possessed of an essential cthereous oil. On the 

 , contrary, the inferior species of them are those whose sub- 

 stance is principally composed of fat or mucilaginous parts, 

 which do not make so strong an impression on the skins, 

 and can scarce serve for tanning the most tender ones. 



Salicaria vulgaris purpurea, foliis ollongis. Tourn. 

 Instit. 253. Lyslmachia spicata purpurea, fortii Plinio. 

 C. B. pin. 246. Purple-flowered loosestrife. 



Ulmaria; Clus. Hist. lys. I. R. iii. 488. Rcginaprati. 

 Podon. Pempt. 57- Oueen of the meadows. 



Comarum ; Linn.Gcn.pl. ed. 5. 5G3. (Juinqucfollum 

 . palustre ruin urn. C. B. pin. 326. Red marsh cinquefoil. 



Filix ramosa major, pinnuHs ohtusis, von dentutis. C. 

 B. pin. 357. Filix fcemina oitic. et Dodon. Pempt.. 462. 



• Common brackens, or female fern. 



Filix non ramosa, ilentata. C. B. pin. 358- Filix mas 

 offic. et Dodon. Pempt. 462. Connnon male fern. 



V'lWs. pal uslris 7n a.ri ma. C.B. Prodr. 150. Water-fern. 



7/ias aculeata, major et minor. C B. Prodr. J 51. 



Pcrsicaria salicis folio, potamogcion angjist folium dicta. 

 Raj. Hist. 184. Arsmart. 



I'ersicaria acida Juvgcrmanni. Water knot-grass. 



Bistorla major, radice minus vel magis inturta. C. B. 

 pin. 192. Snake-weed. 



Tormcntilla .sijlrrsfris. C.B. pin.32G. Wild tormcntil. 



Pimpinella sangiiisorla major. CVB. pin. I60. Large 

 . uild pimpernel. 



CaryopUyllata 



