11)14] on Plant-Autographs and their Revelations 179 



" break " of the current, however, excitation is induced once more, 

 but this time at the anode. These characteristic effects I find 

 repeated also in the plant. At this point it is interesting to institute 

 a comparison between the sensitiveness of a plant and a human 

 being. The most sensitive organ by which an electric current can 



Fig. 4. — Apparatus for Determikation of Latent Period op Mimosa. 

 M, spring motor. W, winding disc. C, projecting catch. H, release 

 handle, pressure on which also completes primary circuit of induction 

 coil. K', short circuit key. The automatic break consists of contact rod 

 adjusted by micrometer screw A. 



be detected is our tongue. An average European, according to 

 Laserstein, can perceive by his tongue a current as feeble as"6*J: 

 microamperes— a microampere being one-millionth part of the unit 

 of current. This value might be subject to certain variation, de- 



i^ 2 



