26 



HATCH EXPEEIMENT STATION 



[Jan. 



Table V. — Records shoiving the Eleclrical Polenlial ( Volts') taken from 

 an Elm Tree and from Free Air — Continued. 



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

 copper plates iu soil. Time of observation, 3 P.M.] 



