1912. 



PUBLIC DOCUMENT — No. 31. 



161 



Table X. — Showing the Electrical Resistance of a Tobacco Plant (Nico- 

 tiana tabacum, Linn.). 



[Resistance in ohms.] 



The object of the experiment was to determine what influence, 

 other factors might have on resistance, such as temperature, 

 etc., but more particuhirly whether variations in temperature 

 were discernible in resistance. The phmts were under tolerably 

 uniform conditions, although the temperature varied, as will be 

 seen in the tables. Platinum electrodes were used, these being 

 driven into the plant at a distance of 14 inches apart. One was 

 driven in at the base and the other near the apex of the stem. 

 There were no very marked coincidences between the changes of 

 temperature and resistance in these experiments, but it should 

 be remarked that the lowest resistance coincides with the highest 

 temperature in Experiments L, IL and IV., while in Experi- 



