476 



EEPORTS ON THE STATE OF SCIENCE. 



PLATE VI. 



■^ 



/^i 



70 



•2^' 



3c 



Experiment 6. — Pea .wedling (November 28, 1907), 



Doubtful diphasic response to mechanical excitation by a scissors cut at 2-.5 cm. 

 from the led-olf region. The time interval between cut and response was estimated 

 at about 30 sees. 



PLATE VII. 



Time in 10 seconds iu the vats. 



Experiment l.—Pea seedling (December 3, 1907). 



Two successive monophasic responses to thermic stimulations, S' and X" at 

 2-5 and 1 cm. respectively from the led-off region. The record shows the lost times 

 to be 5 sees, for X' and 10 sees, for X", measured from the end of the bar signalling 

 the application of heat for 10 sees. The result is anomalous, inasmuch as the shorter 

 distance is associated with the longer time and the greater response, and illustrates the 

 danger of accepting speed of transmission calculated from such data. In subsequent 

 experiments we used shorter periods (ic, |sec.) of heating by stronger currents. 



