800 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



show that with either orientation of the crystal ("A positive" or "B 

 positive ") the current-reading of the galvanometer on charge or on dis- 

 charge is a linear function of the number of charges or discharges per 

 second. 



40 



Figure 5. A positive. Charge current vs. no. charges per second, for various 

 applied voltages v. 



10 20 80 40 



Figure 6. A positive. Discharge current vs. no. di^scharges per second, for 

 various applied voltages v. 



The empirical equations of the curves of Figures 5 to 8, as taken from 

 the curves, are given in Table II. above. 



The equations of Table II. agree closely with the data of Table I. 

 The simplicity of these equations indicates that we are dealing with an 

 orderly phenomenon. The linear relation between charge or discharge 



