asObjeSlsoftbeArtofDyingy^c. jSp 



of wood, with a ftraight piece over it; and the 

 fides made clofe, fo as to confine the vapour, 

 by laying round the edges of the lid, a quantity 

 of damp linen cloth. The fire is then to be 

 raifed, fo as to make the liquor boil, and the 

 boiling is to be continued, for nine hours. 



The procefs is finifhed by taking the cotton 

 out of the liquor, wringing and drying it. But 

 the drying is never to be performed either in a 

 Hove, or in ftrong fun-fhine. The colour will 

 be moft brilliant, if the cotton be dried in the 

 fhade, with a free accefs of air. 



I muft beg the indulgence of the Society for 

 another divifionj in which I fliall endeavour to 

 give a theory of dying, as far as bafes are con- 

 cerned ; and efpecially of the procefs of which 

 we have juft given a detail. 



PART THIRD. 



READ JANUARY 3, I786, 



NOTHING can lead more effeftually to 

 the improvement of any art, than a 

 right underftanding of the inftruments, or 

 agents employed in the praftice. Though long 

 experience may eftablifh a number of fads, yet 

 if the rationale of the manner by which they are 

 produced be not underftood, mifapplications are 

 C c 3 liable 



