Electrolytes on Copper Colloidal Solutions. 587 



Table III. 

 Silver Colloidal Solutions. 



No. 



Tempera- 

 ture 

 Centigrade. 



Velocity (v). 



Viscosity of 



water (ft) at given 



temperature. 



Product. 



1. 



3° 



15-lxlO" 5 



•016214 



24-5 X 10" 7 



2. 



99 



18-6X10" 5 



•013,300 



24-7 X 10 " 7 



3. 



11 



19-6X10' 5 



•012822 



251 Xl0 -7 



4. 



21 



25-3X10" 6 



•009922 



25-0 XlO -7 



5. 



31 



301 Xl0~ 6 



•007972 



24-OxlO" 7 



6. 



40-5 



37-2XHT 6 



•006577 



245 x 10 " 7 



velocity tube, evidently, in order that the results in Table III. 

 may be of value, the temperature coefficients of the two 

 liquids should be the same. These coefficients were compared 

 for a sample of silver colloidal solution and a quantity of 

 water of very nearly the same initial conductivity. The 

 values of the resistances of these liquids at various tempera- 

 tures are recorded in Table IY. and illustrated by the curves 

 in fig. 2. From these we may safely conclude that the tem- 

 perature coefficient of the resistance of colloidal silver 

 solution is that of water itself. 



Table IV. 

 Temperature Coefficients of Resistance. 



Temperature 



(Cent.). 



Eesistance of water 

 (Arb. Sc). 



Eesistance of Ag Sol. 

 (Arb. Units.) 



10° 



5600 





15 





4640 



20 



4420 



4180 



25 



3910 



3720 



30 



3510 



3350 



35 



3150 



3030 



40 



2900 



2790 



45 



2660 



2520 



It is quite justifiable to apply these results for silver solu- 

 tions to the manifestly analogous solutions of the other 



