372 



Mr. H. A. McTaggart on 



Diam. 



Time. 



Volts/cm. 



•36 



22 sees. 



40 



•24 



131 





•18 



H 





•14 



7 





•08 



5 





•02 



20 





It is interesting to observe a sphere so large as *36 mm. in 

 motion. It leaves a trail o£ liquid behind it o£ a con- 

 centration between itself and the rest of the liquid. As the 

 size diminishes the velocity increases to a value larger than 

 that found in any other case. At the smallest size, however, 

 the velocity becomes slow again always — as if a residue of 

 some kind remained to the last before dissolving. 



Readings were also taken for amyl alcohol and water. 



Amyl alcohol and water. 



Cone. 



Diam. 



Time, j Volts/cm. 





•10 



15 sees. 



17 



14 



12 



11 



101 



11 



10 



35 



1/2 sat 



1/4 „ 



1/8 „ 



1/16 „ 



1/32 „ 



1/64 „ 



1/128 „ 









The following readings were taken with a sphere of amyl 

 alcohol placed in pure water and allowed to dissolve : — 



Diam. 



Time. 



Yolts/cm. 



•40 



20 sees. 



35 



•30 



12 





•20 



9 





•14 



8i 





•08 



-z0? 





•04 



11 





•02 



11 





The change of velocity with the size is again shown. 



The relative effects of the first four alcohols on the surface 

 charge are shown in the curves here given. Curves are also 

 given for comparison, showing the effect on the surface 

 tension of the same four alcohols. These latter are taken 



