CONTENTS. 427 



rage. 



§ 31. Resistance of the hurnau body to conduction 376 



§ 32. Galvanic Polarization 377 



§ 33. Ficsistance of liquids to conduction _ 381 



§ 32. ■-• Computation of strength of current by means of an inserted 



Voltameter _ _ 384 



§ 33. « Diminution of the resistance of liquids by heat. 386 



§ 3-i. Galvanic Polarization varies with the force of the current _ . 388 



§ 35. Numerical determination of Polarization 389 



§ 36. Polarization on Platinized Platinum Plates 392 



§ 37. Buff's Eesearches on Galvanic Polarization 394 



§ 38. Diminution of Polarization by heating the liquid 395 



§ 39. Cause of Galvanic Polarization _ 396 



§ 40. Polarization of Liquids 399 



§ 41. Schonbein's Theory of Galvanic Polarization. 400 



§ 42. Hyper-oxide Batteries 401 



§ 43. Grove's Gas Battery 403 



§44. Theory of the Gas Battery 404 



§ 45. Effects of the Gas Battery 406 



§ 46. The Pole Changer 407 



§ 47. Old observations on the relation of iron to nitric acid 411 



§ 48. Schonbein's observations on the passivity of iron 411 



§ 49. Action of iron Electrodes _ 413 



§ 50. Passive iron in a solution of sulphate of copper 416 



§ 51. Pulsations of Passivity 417 



§52, Theory of Passivity 419 



§ 53. Passivity of other metals 421 



