Electrolytes on Copper Colloidal Solutions. 



595 



differ in the two columns. In the last column are copied 

 the various velocities in cms./sec./volt/cm. 



The curves in fig. 3 are drawn with the velocities as 

 .abscissae and the numbers proportional to the number of ions 

 per cc. as ordinates. The very marked overlapping of the 

 curves for potassium phosphate and potassium ferricyanide, 

 which are shown to larger scale in fig. 4, at once suggests 



Fis. 4. 



§ 

 4 





» . MBliiPliliWl 



^ .o 11111H ilp 



. Jl lill \ ■ 





/e/oc/ti/ x /o 



the tact that the two ions P0 4 and Fe0y a have the same 

 power of reducing the velocity of the copper particle, and, 

 therefore, of producing the coagulation of the copper. The 

 evidences of coagulation given in the last columns of 

 Tables VIII. and IX. support the latter statement, as does 

 the work of many other writers. Although the experiments 



2S2 



