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I made trial of the German uva ursi both on whiteand on blue cloth, exactly according to the Swedish di-rections ; boiling the cloth first with vitriol and tartar,and afterwards with a decoction of the uva ursi: on theblue cloth I obtained a tolerably good black, but on thewhite cloth, as with other astringents, the colour was onlya dark brown. I repeated the experiment without themadder, and with a variation in the order of applyingthe other ingredients, boiling the cloth first in a decoctionof the uva urji, and then adding the vitriol and tartar:by this method I obtained, as before, a pretty good blackon the blue cloth, but only a brown on the white. Iafterwards omitted the tartar also, and did not observethat the want of it occasioned any difference in the colourproduced. All the samples dyed brown with uva ursiand vitriol, became black on being passed through log-wood liquor; but without either logwood or a blueground, no true blackness could be obtained. A dyer,whom I consulted on this head, made some trials for me,on the uva urji, with the fame event; this plant givingno black dye with vitriol alone, any more than the otherastringents.

On adding green vitriol to a strong decoction of uvaurji, I took notice of a phenomenon which did not hap-pen at all with galls, and which I do not remember tohave observed, in so remarkable a degree, with any of theother strong astringents. The liquor, instead of theuniform appearance of the common black mixtures ofthis kind, looked like a black powder diffused throughwater; and being written with on paper, the strokes ap-peared everywhere unequal and specky, as if made withcharcoal powder and water, though they were of a deepand durable black where the colouring matter lay thick.This hasty concretion of the black matter from the liquor,

while