Electrical Resistivity of Electrolytic Bismuth. 429 



different resistance-temperature-field curves. The lower the tem- 

 perature the less is the strength of field which will bring the bismuth 

 back to its original resistance when not cooled and not in the field. 



The observations have been set out graphically in the diagrams in 

 fig 8 - 1> 2, and 3, and it will be seen that there are in fig. 1 four curves. 

 Each of these curves corresponds to a different temperature, viz., that 

 of liquid air (-185 C.), liquefying carbonic acid in ether (79 C.), 

 ordinary temperatures (20 C.), and a fourth shorter curve, which 

 corresponds to a very low temperature of 203 C., obtained by 



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evaporating liquid air under a reduced pressure. This last curve is 

 only continued for a short distance. These curves show the mode of 

 variation of the resistance of the bismuth at a constant temperature 

 as a function of the transverse magnetic field ; and they show how 



