1887.] Mr W. Peddie on Transition Resistance. 227 
Other experiments of the same kind were made, and gave nearly 
the same result. So that evidently in the course of 40 hours a re- 
sistance of about 40 or 50 ohms appeared in the circuit. The next 
point to be determined was whether or not this resistance followed 
the law of inverse proportionality to tbe surface. One or two pre- 
liminary experiments were made, which showed that if the plates 
were connected by a short copper wire for 15 minutes, all previous 
polarization was discharged, — at least so far as the galvanometer 
could detect it. In what follows the plates were raised roughly 
about one-half out of the liquid, so that the transition-resistance 
should be approximately doubled if it follows the above-mentioned 
law. The numbers in this series of experiments cannot be compared 
direetly with those in the first, as the arrangement of resistance in 
the circuit was different. 
Experiment 1. — Plates connected for about 40 hours. 
Deflection. — 5, 4, 3, 3, 2. 
Experiment la. — Plates heated, and 96 ohms added. 
Deflection. — 5, 3, 2, 2, P5. 
Experiment IK — Plates connected for half an hour, 110 ohms added. 
Deflection. — 5, 4, 4, 3, 3, 3, 2. 
Experiment 1 c. — Plates connected for half an hour, 110 ohms added. 
Deflection. — 5, 4, 4, 3, 3. 
Experiment Id. — Plates connected for one quarter of an hour; 
no resistance added. 
Deflection. — 18, 17, 16, 15, 14. 
Other similar experiments giving much the same results were 
made, but need not be quoted. Evidently the resistance is inversely 
proportional to the area of the plates. 
Time during which the Resistance Increases. 
Experiments were made in which the plates were left half out of 
the liquid for 20 hours. In this case a resistance of from 80 to 90 
ohms, roughly, was found. (The numbers must be given roughly, 
