IGO EXPERIMExXT STATION. [Jan. 



around the electrodes, wliicli were inserted 1 foot apart, as in 

 the other experiments. The l)raneh was ])laee<l in water at room 

 temperature of from G8° to 70"^ F. The following results were 

 obtained : — 



Ohms. 



10.00 A.^u, 110,000 



10.30 A.M., 100,000 



11.00 A.M., 100,000 



11.30 A.M., 105,000 



Experiment I. 

 The same branch was used as in Experiment II, and a fresh 

 cut made under water, the water being heated for three hours 

 at a temperature ranging from 149 to 150°. After three hours 

 at this temperature the following readings were obtained : — 



Ohms. 



1.30 P.M., 140,000 



2.00 P.M., 135,000 



2.30 P.M., 138,000 



3.00 P.M., 142,000 



3.30 P.M., 150,000 



It will be noted that the resistances w^ere higher here than in 

 the others, although the temperature of the water in the latter 

 case was very much higher than in the former experiment. 



Experiments with Small Plaxts. 

 Some experiments were made wdth small ])laiits in the green- 

 house in February to determine the electrical resistance. For 

 this purpose we made use of tobacco plants in pots, the plants 

 being 3 feet high. The results of these experiments, made by 

 Mr. Chapman, follow : — 



