206 J. Aw POLLOCK AND A. B. B. RANCLAUD. 
to several amperes; the critical points are shown at x in 
the figures. 
Fig. 5. 
Distance between| Carbons 
2mm. 
Ld 
Milliampéres. 
Distance between Carbons 
Minivan per e s. 
To exhibit the form of the connection between potential 
difference and current, for the non-luminous régime, when 
