28 



HATCH EXPERIMENT STATION. 



[Ja 



Table V. — Records showing the Electrical Folential (^Volls) taken from 

 an Elm Tree andfroin Free Air — Concluded. 



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

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



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

 wind; October 24, leaves entirely off trees. 



