Indigofera, DIADELPHIA DECANDRIA. 379 
parts of India make use of it,” The process by which 1 
obtained the colour from the leaves, wa’ exactly similar to 
that practised for obtaining the Indigo from the leaves of 
Nerium tinctorium, viz. by committing them while fresh, to 
cold water, and scalding them over a moderate fire, to about 
one hundred and sixty degrees of Fahrenhcit’s thermometer, 
the liquor will then have attained a beautiful deep greenish 
yellow colour; it is then strained off clear, and while hot, 
gently digitata in a broad, shallow, open vessel for a few, 
(twenty to thirty) minutes; during which time it changes its 
colour, gradually becoming darker and darker and more tur- 
bid when sufficiently agitated, if a little of it be viewed ina 
clean silver spoon, or any other vessel that reflects the light, a 
muddiness, or minute grain may be easily seen, which is ren- 
dered large,and copious by the addition of a little lime-water ; 
this foecula readily falls to the bottom, the superincumbent li- 
-quor is then poured off, and will be more or less of a clear 
brandy colour, according as the operation has been success- 
fully conducted; for the more this liquor is tinged with 
green, the less perfectly has the colour been separated ; and 
the produce, of course the more deficient and less beautiful. 
How to effect the most perfect separation, and precipitation 
of the colour, is the grand desideratum with our Indigo ma- 
nufacturers, and well deserves the chemist’s most serious at- 
~ tention. Pt 
16.1. tinctoria, Willd. iii. 1237. | 
Shrubby. Leaves pinnate ; leaflets about five-paired, long- 
obovate, smooth, Racemes shorter than the leaves, Legumes 
reflexed, nearly straight, smooth, about ten-seeded. 
- Pers. Derukht-neel, the plant ; and Neelep the Indigo. 
“Arab. Izlum, or Lee-lunj the plant; ned Neelep the In- 
Beng. Nil, or Neel. Lo get 
Teling. Neel. 2 pained gisis Or 
ge : 
