148 



EXPERIMENT STATION. 

 Table III. — Concluded. 



[Jan. 



Date. 



Tempera- 

 ture. 



East. 



South. 



West. 



North. 



May 8, . . . 

 14, . . . 

 21, . . . 



28. . . . 

 Average for month, 



58 



18,500 

 14,000 

 24,000 

 27.800 



21,000 

 14,600 

 23,000 

 23,000 



21,075 



20,550 



19,000 

 15,000 

 23,000 

 29,600 



21,650 



23,000 

 16,000 

 33,000 

 26,000 



24,500 



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

 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. 



lElectrode3 10 feet apart. Mean daily temperatures given in degrees F.l 



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

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



