2a a 
the yarn, and thus leaves a_ black tinge; whereas Mr. CLarKe’s 
is free from this contamination, to fay nothing of the far greater 
quantity of alkali it contains, infomuch that one tun of CLARKE’s 
is nearly equal to eight tun of kelp. Hence it clearly follows 
that the linen manufa@ture ftands in no fort of need of foreign 
falts or afhes for the proceffes of bleaching. 
Tue chief defect in Mr. CLarxe’s manipulation is the lofs of 
time during what he calls the maceration of afhes and quick lime; 
by barely moiftening them the fame effe& may be produced in 
nine hours which he expeéts from their maceration during nine 
months, and much more lime is ufed than is neceflary. 
Dantzic pearl afh contains much more alkali than CLarke’s ; 
this muft proceed from the fuperior quality of the afhes from 
which it is extracted. 'Thofe I received from Mr. CLarKe were 
exceeding bad; nor do I believe that any crude afhes can be 
advantageoufly ufed in bleaching. But if fome perfons in the 
different manufa@turing counties would allot a few acres to the 
culture of wormwood and fumitary, I believe their own advan- 
tage, as well as that of the public, would thereby be confiderably 
promoted. An acre will, I fuppofe, fcarcely produce lefs than 
four tun of the dry weeds, and each tun will afford nearly 200 
weight of afhes, and each tun of wormwood afhes will give nearly 
1500 weight of unrefined falt, or 1300 of the refined. 
Tue alkali, manufatured after the manner I have indicated 
in the feventh feGiion, may not be fufficiently cauftic for the 
earlier 
