210 MESSES. A. V. HAECOUET AND W. ESSON ON THE LAWS OF CONNEXION 



Table X. 



K2 Mn2 Og+SOMn S O4+5OO Hg C^ O^+nfSOO Hg S OJ. 



Volume of solution 200 cub. centims. Temp. 17° C. Time x mins. 



Of these experiments three series, those with 300, 400, and 500 proportional parts of 

 sulphuric acid, give numbers which conform kpproximately to the relation y=«e~'", but 

 the more rapid action which occurs with 800 and with 1000 parts of acid cannot be 

 expressed by an equation of this form. The excess of the other reagents over that which 

 suffers reduction is as great, and that of the sulphuric acid greater, in these than in the 

 first experiments. Some other cause than a change in the medium in which the gradual 

 action takes place must therefore produce this departure from the theoretical result. 

 Comparing the former set of determinations with these, it appears also that the diver- 

 gence in both is of the same kind, and therefore presumably due to the same cause. 

 In both the ratio of the descending series gradually diminishes. The true reason is 

 probably to be found in the fact that more than one gradual change takes place under 

 the circumstances of our experiments, and that we have only been able to measure the 

 total result. Our attempts to separate these actions and investigate them singly have 



