ON MANGANESE 59 



was carefully closed and left for several days in the cold, 

 during which time it was now and then agitated. The 

 liquor was afterwards filtered and alkali added to it, upon 

 which a white powder precipitated. The manganese like- 

 wise separated from its solution on standing a few days in 

 the open air. 



SECTION XIII. 



Such are the effects of acids upon manganese. What is 

 most remarkable in them is, that some of the acids, such 

 as the volatile sulphureous, the phlogisticated nitrous, the 

 common muriatic acids, and the acid of lemon, completely 

 dissolve it. Others during the solution cause a considerable 

 effervescence ; others again produce the solution quietly, and 

 others dissolve a part of the manganese only. Before I 

 enter upon any explication of these singular phenomena, it will 

 be necessary to point out the general properties of manganese. 



SECTION XIV. 



(1) Manganese has a strong elective attraction for all 

 phlogistic substances. (2) This attraction becomes stronger 

 if there be a menstruum present which at the same time can 

 unite with the phlogisticated manganese. In this situation 

 the manganese is able to attract phlogiston more strongly than 

 the nitrous acid does vid humidd. (3) When manganese 

 is saturated with phlogiston, it loses its black and assumes 

 a white colour, which however disappears as soon as the 

 phlogiston is separated from it again. (4) Without com- 

 bining it with phlogiston, there is no way of producing a 

 colourless solution of manganese in any acid ; and whenever 

 phlogiston is wanting, the solution becomes blue or red. 

 By means of these four general qualities of manganese, 



