SENSORY FARADIC THRESHOLD. 



143 



Wherever possible, the results are given in both Z and /3 units. 

 computed from the reading of the secondary coil by the formula 



Z is 



fj 





X 



M 



In this formula, y- is a constant depending on the relation between the 



primary and secondary coils at that particular position for our 

 inductorium. Its value is given either directly by Professor Martin's 

 calibration of our inductorium, or by interpolation between those values. 

 Ic is the intensity of the primary current in amperes corrected by the 

 empirically determined constant for our inductorium, according to the 

 formula Ic = Io (1+0.41 Id). 



TABLE 23. Summary of threshold measurements for Faradic stimulation. 

 [Values given in Martin's Z units.] 



'Alcohol values minus normal values. 



2 Percentile effect equals the effect of the alcohol on the average Z difference divided by the 

 average of the corresponding normals of the day. 

 3 Dose C was given in this experiment. 



j8 is computed from the reading of the position of the secondary coil 

 by Wilbur's simplification of the Martin formula for /3 as published in 

 "The Nocturnal Variation of the Sensory Threshold," by Martin, 

 Bigelow, and Wilbur. 1 



Zr R' - Zr' R 



ft ~' R' - R 



'Martin, Bigelow, and Wilbur, Am. Journ. Phyaiol., 1914, 33, p. 415. 



