DURABLE AND" SUPERIOR LAKE, 221 



quired for it fo little expenfive, that it might be in the power 

 of any grower of the root to extract the colour : befides 

 which, another great advantage would be obtained ; the 

 colour thus feparated from the root, may be kept any length may be kept fur 



of ti 



me, without danger of fpoiling, and its carriage would 



a long tinrc, 



be only one fourth of that of the root. I am, moreover, 



thoroughly inclined to believe, that in the prefent mode of 



ufing the root, a very considerable part of the colour is left in 



it by the dyers; and, mould this prove to be the cafe, an and probably be 



advantage much greater than any hitherto adverted to, may 



arifefrom the procefs here recommended. 



Should it be attempted to obtain the colour from the frefli Directions for 

 root, on an extenfive fcale, I fliould recommend, that themanufaSy of 

 root be firft reduced to as uniform a pulp as poffible, by grind- madder colour. 

 ing or pounding. To this purpofe, it is probable that the 

 cyder-mill would anfwer perfectly well ; and its extreme 

 fimplicity is a great recommendation. For the purpofe of 

 trituration, bags of woolen, fuch as are ufed in the oil-mills, 

 would probably anfwer as well as calico, and they would be 

 much cheaper and more durable. A large vat, with Hamper.*, 

 would be eafily conftrufted, by thofe who are converfant in 

 mechanics, for the holding them and preffing them in water ; 

 and when the colour was boiled and precipitated, the flues 

 of the boilers might eafily be formed into convenient drying 

 tables, without any additional expenfe of fuel. The part of 

 the procefs, which I confider as of the greateft importance, 

 and as being the elTential advantage of my methods over all 

 thofe which have come to my knowledge, is the trituration 

 or preffing of the root in water ; and I believe that the 

 colouring matter of the root has not been hitherto confidered 

 as i'o nearly infoluble in water, as I have reafon to think it is. 



It were much to be wifhed, that in the prefent advanced We want a good 

 ftate of Chemiftry, fome ftilful analyfer would invefligate ™] yfn of mad " 

 the properties of this very ufeful root; in which perhaps it 

 will be found, that there are three, if not four, different 

 colouring fubftances. Such are the proceffes and views, 

 which I have thought it, not improper to fubmit to the con- 

 federation of the Society of Arts, ckc. 



I have only now to defcribe the fpecimens which accom- The fpecimen* 

 pany this paper ; alluring the Society, that they have been all ^J^'" 

 prepared by my own hands entirely, and that I am therefore 



jefponfible 



