Manganefe. 353 



water s the Pruffian manganefe will be dif- 

 folved, and the PruJJian iron remain undif- 

 folved. See alfo Chap. 5. N?4i and 53. 



Manganefe in Vegetables. 



19. " Manganefe feems to be contained 

 in the afhes of moft vegetables, and to it 

 the blue or greenifh colour of calcined ve- 

 getable alkali is owing. Thefe colours 

 are generally attributed to the phlogifton 

 " of the alkali ; but if fo, they fhould not 

 *' be found in fixed nitre, as the nitrous acid 

 '* fhould carry off during its decompofition 

 u all the phlogifton ; yet this alkali is always 

 " greenifh, fo that the colour feems to arife 

 " from the afhes of the charcoal with which 

 " the nitre was decompofed. If 3 parts of 

 " the alkafi of tartar, i of fifted afhes, and 

 " % of nitre be melted together, they form 

 " a dark green mafs, which being diflblved 

 " in water affords a beautiful green folution, 

 " and this being filtered, on the addition of a 

 " few drops of oil of vitriol, becomes red, 

 " and after a few days a brown powder is 

 * 4 depofited, which has the properties of 

 " manganefe." Scheele 56 Mem. Stock. 

 3C 774> P* 189. The afhes of ferpyllum con- 

 tain very little of it, thofe of trees contaia 

 moft. Jbid. 1 80. 



A a CHAP, 



