CONTENTS. IX 



VAGK 



Electricity as a motive force in animals Probability of its 

 being the only motive force Structure of the muscles and 

 electric action on them Ampere's theory of electric cur- 

 rents Telegraphic and electro-mechanical nature of 

 animal motion . . . . . . .56 



CHAPTER V. 



Animal motion Spontaneous, involuntary and diseased motions 

 Capable of being artificially produced Defects in 

 Mesmerism Want of uniformity in its results Electro- 

 biology and Phrenology The brain Propensities 

 Cerebral development no proof of propensity Alleged 

 propensity not consistently shown in .experience Pro- 

 pensity not material but metaphysical, and cannot be indi- 

 cated by size and quantity of matter Exercise causes 

 development Small mental power capable of great 

 achievements Accountability of human life Eight and 

 wrong divide the universe Danger of error Tendencies 

 of the age Opinion Difference between Opinion and 

 Conviction Not necessary to form opinion as a basis of 

 action Opinion not truth An impediment to correct 

 action An illustration of this Case of an African 

 traveller Confusion as to opinion O ir means of protec- 

 tion against error ...... 71 



I .NATURAL 



