INTRODUCTION. Xill 



to make a division, according to the final chemical 

 products, into oxidation, reduction, substitution or 

 addition, and condensation reactions. But here we 

 are confronted by the difficulty that frequently sev- 

 eral different processes occur at the same time, 

 making the indicated classification difficult to accom- 

 plish. I regard it as the simplest method to treat 

 the subject in accordance with the chemical character 

 of the electrolytes. 



