252 



Through the experience, received by Ihe present in- 

 vestigation, the capital part of the inflaence of electricity 

 on the plants, has obtained its explanation. Here we have 

 also to search for the principal cause, of the circumstance 

 that investigators in this departements have received such 

 contradictory results: they have not made their experiments 

 w^ith the same pole. 



Though favourable results; can be obtained with cer- 

 tainty if the right method is cmployed by the influence of 

 Electricity on plants, the question is by no means exhausted, 

 for it remains to investigate the influence of the positive 

 current, even as tlie changes which the air itself and 

 other gases in it, are undergoing by the electrieal current 

 in question. These researches are in intimate connexion 

 with the electrieal current in the atmosphere, the investi- 

 gation of] which must now be taken up in the program of 

 the future. 



Ser. I, 



Ser. II. 



