15 



plants is, that grown in rotation they have an opposite effect upon 

 the soil to cereals. It may be that each variety of crop will re- 

 quire an electrical treatment of its own, some may respond to a 

 stronger, some to a weaker discharge ; the right amount of hours, 

 according to climatic conditions will require to be known, and 

 it will have to be seen if the plants only benefit at certain stages 

 in their development. Only careful trials and minute scientific 

 research will solve these questions and it remains for those who 

 have time to devote to them, and who are not altogether depen- 

 dent upon the products of their farms for a living to thoroughly 

 investigate the subject and observe every detail connected with 

 their experiments. 



One of the large insulators used in the Electric 

 Discharge Installation, shown in comparison with an 

 ordinary telegraphic insulator. 



