22 



HATCH EXPERIMENT STATION. 



[Jan, 



Tabi^e V. — Becoi'ds showing the Electrical Potential ( Volts') taken frotn 

 an Elm Tree and from Free Air — Continued. 



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

 leaved, seeds beginning to drop; heavy thunder showers on 26th; 5 p.m. readings gave 

 extremely high and fluctuating potentials. 



