90 STUDIES IN ELECTRO-PHYSIOLOGY: 



well as in conductors, but much more slowly in the first 

 case than in the second, the velocity varying from a few 

 centimetres to 300,000 kilometres per second. In the 

 enormous margin between the two there is ample room for 

 speculation as to the causes which contribute to the 

 comparative sluggishness of the human nerve-current. 



The same authority showed that the particles emitted 

 by an electrified point were identical with those which 

 came forth from radium ; suggesting, by inference, that 

 the force known as electricity may be made up of more 

 than one form of energy. 



