274 



PROCEEDINGS OF THE AMERICAN ACADEMY 



I. 2{Co 2 (NH 3 ) 12 (S0 4 ) 3 + Ce 2 (S0 4 ) 3 } + 3 aq. 



II. 2{Co 2 (NH 3 ) 12 (S0 4 ) 3 } + 3{Ce(S0 4 ) 2 } + 3 aq. 



III. 2{Co 2 (NH 3 ) 10 (SO 4 ) 3 + Ce 2 (S0 4 ) 3 ^ + 9 aq. 



IV. 2{Co 2 (NH 3 ) 10 (SO 4 ) 3 +3{Ce(S0 4 ) 2 } +9aq. 



Mr. W. J. Karslake has arrived independently at the same for- 

 mulas, and has calculated the percentages as required by them. 



For Formula I. 



24NH 3 

 4 Co 

 4 Ce 



12 S0 4 

 3 H 2 



408 



236 



560 



1152 



54 



2310 



For Formula IV. 



20 NH 3 



4 Co 



4 Ce 

 12 S0 4 



9H 2 



100.00 



The analyses are those of Wing. Recent determinations of the 

 molecular masses of the cobaltamines have shown that the chlorides, 



