148 



EXPERIMENT STATION, 

 Table III. — Concluded. 



[Jan. 



Table IV. — Showing Electrical Resistance (in Ohms) of Elm (Ubnus 

 Americana, L.), made Weekly and covering a Period of Nearly Three 

 Months. Resistances taken on the North, South, East and West Sides 

 of the Tree. 



lElectrodes 10 feet apart. Mean daily temperatures given in degrees F.l 



The data in Tables III. and IV. cover weekly observations 

 extending over a part of three diflferent months, the same trees 



