28 



HATCH EXPERIMENT STATION, 



[Jill 



Table V. — Records showing the Electrical Potential {Volts) taken from 

 an Elm Tree and from Free Air — Concluded. 



[Collector III., 12 feet high, in Norway spruce. Nos. IV. and V., readings taken fi-oni 

 copper plates in soil. Time of observatiou, 9 a.m.] 



October 5, leaves turning color, very few falling; October 20, leaves taken off by high 

 wind; October 24, leaves entirely' off trees. 



