Springs at Lemington Priors. 183 
ver spoon; and, then, by fusion, it regained the red 
colour. Toavoid the possibility oferror, alittle man- 
ganese, fused with borax in the same manner,was plac- 
ed beside the red globule ; and no difference could 
be perceived in the colour of the two globules, ex- 
cept a slight variety in the intensity.* 2. The Jemon- 
coloured precipitate, formed by the tincture of galls 
(iv. §-), yields the same result. By using a large 
quantity of water, I collected sufficient for exami- 
nation. This I put over a fire on an iron plate: 
the vegetable part took fire and burnt away: the 
powder became of an ochry yellow, and was mag- 
netic :—fused with borax, by the blowpipe, it ac- 
quired the redness which manganese imparts. 
3- The same fact may be proved by a single ex- 
periment. It is known, that tartrite of potash 
decomposes salts of manganese by a double affini- 
ty; in consequence of which, tartrite of manga- 
nese, which is a substance insoluble in water, pre- 
cipitates.t I poured, therefore, a solution of tar- 
trite of potash into the water; and there fell a co- 
pious crystalline precipitate. Much iron fell down 
* I am aware of the observation of Bergman, that zinc 
‘does not precipitate solutions of manganese, See his Es- 
Says, vol. iii. p. 414. But, besides that I describe only 
what I have seen, it will appear that the salt in question is 
of so peculiar a nature, that it cannot be expected to obey 
the usual analogies of the other solutions, 
t See Scheele, as above, 
