1792. "on the culture of madder. 139 
ON THE CULTURE AND USES OF MADDER. 
Continued from p. 112. 
Account of M. d’ Ambourney’s experiments on the green root. 
Iw the first place, says he, I wafhed the roots clean,” 
that no earthy particles might remain on them ;-and as I 
had experienced that madder loses seven-eighths of its 
weight, when dried sufficiently to be ground into powder, 
I thought it would not be amifs if I proportioned my 
quantity accordingly. 
‘ With this view, in a bath which would have required 
one pound of ground madder, I infused eight pounds of 
the green root, being first pounded in a mortar; and, having 
dyed some cotton with it in the ordinary way, I found. 
that the bath was still charged with colour, and that the' 
cotton was so deeply dyed that it required two boilings 
to bring it to the common fhade or tint. 
‘ I continued to make the experiment with six, and 
with four pounds of green root; and, with the last men- 
tioned quantity, I obtained a colour like that whieh is got 
from one pound of the dried root in powder. 
“ As this is the case, half the quantity of the root is 
saved by using it green; yet this, though well worth our 
attention, is not the only saving. 
“1. The expence of erecting stoves and fheds, to dry 
the roots in uncertain weather, is entirely saved. 
‘ u. There is no danger of lofs ensuing from the root 
being dried two quickly or too slowly, either of which 
is prejudicial to its colour. 
*“ m1. The waste occasioned by cleaning the roots, when 
all those of the size of the tag of a lace are lost among 
the rubbith, is avoided, 
