jS14.] Definite Proportions in Chemical Comlinat'ions. S77 



Number of Weight of an 



atoms. integraut particle. 



2^'- Percarbonate of mercury 1 c + 2 m 56-751 p 



243 Percarbonate of copper .. 1 c + 1 c 12-751 *» 



244 Carbonate of iron 2 c + I i 14- 168 ' 



245 Carlvnateof lead 2 c + I I 33-476" 



246 Carbonate of nickel 2 c + In 14-804* 



247 Carbonate of zinc 1 c + 1 z 7-890 ' 



248 Carbonate of manganese 2 c + 1 w 13-6"32 * 



249 Carbonate of cerium 2 c + 1 ce 18-996 J^ 



250 Percarbonate of cerium . ,3 c + 1 ce 21*747* 



These 24 are all the carbonates with which we are at present 

 acquainted. Most of the other metals do not seem capable of 

 forming carbonates. Upon examination it will be found that all 



+ 83-194 base. Now Berzelius found it composed of 15-9 acid 

 + 84-1 base. (L'irhok i Kemien, ii. 39S.) 



P Though this nearly agrees with the analysis of Bergman, yet 

 little stress can be put upon it. 



'' This supposes the salt composed of 19'73 acid + 71*719 per- 

 oxide. Now Rerzt'Iiiis found it composed of 19-73 acid 4- 7 1*7 

 peroxide. (Larbok i Kemien, ii. 333.) 



' According to the analysis of Klaproth this salt is composed of 

 38-3 acid + Gl-G base. Now the statement in the table suppcsts 

 it a compound of 38-3 acid + 60-325 base. 



' This agrees exactly with the analysis of Bei-zellus, "and very 

 nearly with that of all other chemists. It supposes the salt a co?n- 

 pound of 16*446 acid + 83*554 deutoxide of lead. Now Berzelius 

 obtained 16*444 acid + 83*333 oxide. (See Jmiah of PhUosoplnjy 

 vol. iii. p. CO.) 



' This statement comes nearest to the analysis of Proust, but 

 does not agree with it completely. Proust found carbonate of nickel 

 composed of 100 acid 4- 173*5 oxide. The statement in the table 

 makes it a compound of 100 acid + 169-12 oxide. The diifcrcncc 

 scarcely exceeds 2 per cent. 



" According to Mr. Smithson this carbonate is composed of I 

 acid + 2 oxide. Now the statement in the table supposed it a 

 compound of 1 acid + 1-868 oxide. 



^ This supposes the salt a compound of 34-16 acid + 50-476 

 oxide. Now John's analysis gives us 34-16 acid + 55-84 oxide. 

 This does not correspond well. Hence the number in the table is 

 doubtful. 



-^ This supposes the salt composed of 22*7 acid + 55-545 deut- 

 oxide. Now llisinger's analysis gives us 22*7 acid + .'i7'9 oxide. 



* 'J'his supposes the salt to be composed of 36*17 <icid + 7'J-28 

 peroxide. Now Hisingcr's analysis gives us 36- 1 7 acid + 63-83 

 peroxide. 



