230 On eKtraB'tngVtmfrem the Lichfit, 



and for ftlffcning filks, crapes and gauzes, it {hould be extrafted from the lichen without 

 employing any alkaline falls, continuing the boiling or digeftion longer, and with a 

 moderate degree of heat, in which cafe the gummy extraft will be nearly colourlefs. 



When volatile alkali is ufed, the boiler fliould be of iron, as volatile alkali a£ls oa 

 copper. 



i iMli -T^r 



Statement of the Benefits and Mvatttages to enftie to Individuals and to the United Kingdom of 

 Great Britain and Ireland, from Lord Dundonald^s Hifcovery of extraEiing Gum from the 

 Ifichen-, or Tree Mofs, as a Subjlitute for Gum Senegal^ and other Foreign Gums. 



Gum Senegal, or other foreign gums, have hitherto been indifpenfably requifite for 

 fine goods, and thofe of light fliades of colour. 



No proper fubftitute had been found to anfwer for this part of calico printing, until 

 Lord Dundonald difcovered the preparing gum from the lichen. 



Gum Senegal, and foreign gums, are at times fcarce, and diiScult to be procured. 



The fettlement of Senagambia belongs to the French. They have a monopoly of gum 

 Senegal. The price fince the war has rifen from 15OI. to 400I. per ton. 



Gum from the lichen may, all charges included, be prepared at one-fourteenth part of 

 the prefent price of gum Senegal, and at one-fixth of the peace-time price. 



The United Kingdoms may now be faid to be independent of foreign ftates for the gum 

 requifite for their manufaftures, fuch as calico printing, preparation of ink, ftaining and 

 manufafture of paper, drefling and ftifFening filks, &c. &c. And, in confequencc of 

 Lord Dundonald's difcovery, large fums of money formerly fent abroad for the purchafe of 

 gum, will, in future, be faved. 



Starch and wheaten flour have hitherto been ufed as cheap fubftitutes for gum, in 

 printing coajfe goods, or to fix on other printed goods, the mordants, and fome of the 

 dyeing materials, for deep Hiades of colour. But there is now reafon to expedl, as gilm 

 from the lichen will coft lefs than thofe articles, particularly ^orcA, it will be ufed in their 

 ftead, and fo prove the means of faving, or oeconomizing a confiderable proportion of 

 wheat and wheaten flour, at prefent confumed in calico printing. 



The colle£ting the lichen from the foreft and fruit trees and hedges, will give employ- 

 ment to a number of poor people, principally women and children. 



A cheap fupply of gum from the lichen, may perhaps, in feveral manufactures, fuperfede 

 the ufe of the higher priced article of glue or fize, which often has a very difagreeable 

 fmell. 



Gum from the lichen, may perhaps, be ufed as a drefling in weaving, particularly fine 

 goods, either by itfelf, or when made into a kind of foap, according to diredtions given 

 in a feparate publication. 



Laftly, 



