22 



HATCH EXPERIMENT STATION 



[Jan . 



Table V. — Eecorcls showing the Electrical Poteidial ( Volts') taken from 

 an Elm Tree and from Free Air — Continued. 



May 7, leaves beginninp: to show ; May 9, hardly a trace ; May 14, trees fairly well 

 leaved, seeds beginning to drop ; lieavy thunder showers on 20th; 5 p.m. readings gave 

 extremely high and fluctuating potentials. 



