ELECTRICAL MEASUREMENT. 443 



great accuracy the relation between electrostatic 

 and electro-magnetic units but also in connection 

 with physical theory. It seems, up to the present 

 time, that the more accurate such an experiment 

 becomes, the more nearly does the result approach 

 to being equal to the velocity of light, but still we 

 must hold opinion in reserve before we can say 

 that. The result has to be much closer than has 

 been shown by the experiments already made 

 before the suggestion can be accepted. But you 

 can all see by the mere mention of such a subject 

 how intensely interesting the pursuing of these 

 investigations further must be, and I believe 

 Maxwell is at present making a measurement of 

 this kind on a different plan from any that have 

 been yet made. I have now spoken too long, 

 or I should have described something of the 

 methods already followed in this department, but 

 they are already fully published, and can easily 

 be referred to. 



Now with respect to accurate measurement 

 theory was left far behind by practice, and I need 

 not to be reminded by the presence of our 



