274 Contributions towards [Oct. 



be only 7*130 : and the weight of an integrant particle of each 

 of these oxides will be as follows: — 



Protoxide 8*180 



Deutoxide 9*130 



Tritoxide 10-130 



Peroxide 11*130 



3. The only salts of manganese of which the composition is 

 o-iven in the preceding paper are the carbonate, sulphate, sul- 

 phite, and muriate. These, according to the analysis of John, 

 are composed as follows : — ■ 



1. Carbonate of 100 protoxide + 61*17 acid + 17*91 water. 



2. Sulphate 100 + 108*53 + 1 14* 



3. Sulphite 100 + 94*45 + 54*43 



4. Muriate 100 + 52*05 + 107*63 



Or perhaps the composition will be more evident by stating it 

 in the following manner, taking the weight of an atom of pro- 

 toxide as the basis : — 



Protoxide. Acid. Water. 



Carbonate 8*136 -f- 4*972 -4- 1*455 



Sulphate 8*130 + 8*823 + 9*268 



Sulphite ..... 8*130 + 7'678 + 4*425 



Muriate 8*130 + 4*4-31 -f- 8*754 



There can be little doubt that the weight of an integrant 

 particle of each of the acids which enter into the composition 

 of these salts is as follows: — 



Carbonic acid 2*751 



Sulphuric acid 5*000 



Sulphurous acid 4*000 



Muriatic acid 2*365 



An integrant particle of water weighs 1*132. If we compare 

 these numbers with the preceding table we shall find an approxi- 

 mation to two integrant particles of each acid combined with one 

 integrant particle of protoxide in each of the salts. The reason 

 why the numbers do not accord exactly with two integrant par- 

 ticles of the acid is doubtless because some error has been com- 

 mitted in determining the composition, either of the protoxide 

 of manganese, or of the salts into which it enters. Both 

 determinations are probably erroneous to a certain amount. If 

 the quantity of oxygen in the protoxide were a very little less 

 than Berzelius found it, the weight of an integrant particle of 

 the protoxide would be somewhat greater, and this would aug- 

 ment the number indicating the proportion of acid somewhat. 

 With respect to the water contained in these salts, it would 



