viii PREFACE 



structure that electrical action was precedent to chemical 

 change. If not, if, on the contrary, the body consisted of 

 a congeries of chemical laboratories, with only an oc- 

 casional suggestion of an electrical circuit, then I was 

 self -deceived 



To this d 

 cell electrica 

 the form anc 

 to guide us 

 elusive proo 

 fluid and tw 

 the particles 

 with those c 

 give off a fo 

 can be show 

 element. \^ 

 we know \ 

 advancing n< 

 ing, and fail 

 is only one 1 

 one law for 1 

 There are, o 

 of structure, 

 pages, gove 

 upon this ea 



London, 191' 



