358 



Mr, J. Small. Changes of Electrical 



expected with the physiological variation of the individuals (c/. Trondle (8) ), 

 and the diflference between ih.Q percentage reductions is much less variable, %.e. 

 5-15 per cent. 



-20 



-30 -40 -50 -60 -70 



angle with vertical 

 Fig. 10. 



-90 +90 



400 



350 



300 - 



250 - 



200- 



<_i ISO 



30 



40 50 60 70 80 



anglt with vertical 

 Fig. 11. 



90 



Hxjyerivient 5 : R = 10,000 ohms. 



Angle with Tei-ticiil ... 0°, 0° -45° -50° -60° -70° -80° -90° 



Total resistance 12,321 12,222 10,493 10,040 9802 9531 9267 9342 



Decrement of resistance — — 1,729 2,182 2420 2691 2955 2880 



The curve of these results (fig. 12) closely approximates the upper part of 

 the curve in fig. 10 and displays the sigmoid character again.* 



* Loeb and Osterhout (6) agree with Waller (9) in regarding the Weber-Fechner Law 

 as governing many phenomena of stimulation, and Osterhout has suggested a dynamical 

 explanation of the law. 



