C2£ DISABLE AND SVtRRlOR t'AKE. 



refponfible for their having been produced by the procefles 

 ftated, without the addition of any foreign matter whatever, 

 excepting the cake ground up with gum, and the bladder of 

 oil-colour, which were prepared from the colour which I gave 

 him, by Mr. Newman, of Soho-Square, whofe fkill and 

 fidelity are too well known to need any teftimony in their 

 favour. 



It may be proper to add, that all the colours produced from 

 the Dutch madder were prepared from the fame parcel of crop 

 madder, in order that the differences in them might proceed 

 from the procefles, and not from, a variation in the qualities of 

 the root, which, in different fpecimens, will produce differ- 

 ent fliades of colour under the fame mode of treatment.* 



1. Dutch madder, treated by procefs iff. 



2. Ditto - procefs 2d. 



3. Ditto - procefs 3d. 



4. Ditto - procefs 4th. 



5. Dutch madder, two ounces; alum, half an ounce; 



treated by procefs 2. 



6. Dutch madder, two ounces; alum, one ounce; fer- 



mented two days, and then treated by procefs 2. 



7. Produce of procefs 1, ground in gum by Mr. Newman. 



8. Produce of procefs 1, ground in oil by Mr. Newman. 



S — 1. Smyrna madder, by procefs I. 



S— 2. Ditto - - - procefs 2. 



S_3. Ditto - procefs 3. 



S— 4. Ditto - - - procefs 4. 



* Certificates accompanied the foregoing de'fcription, from 

 Mr. Cotman and Mr. Munn, teftifying the merits of Sir H. Engle- 

 field's madder lakes, as water colours; and alfo, from MefTrs. 

 Weft, Trumbull, Opie, Turner, Daniel, and Hoppner, fpeak- 

 ing gready iu its favour, where it has been tried in oil-colours. 



The 



