CONTENTS. IX 



Page 



Atmospheric electricity 346 



Miscellaneous experiments 352 



Practical rules for performing experiments 366 



Animal electricity.. 373 



Medical electricity 375 



GALVANISM.. 381 



MAGNETISM 396 



Magnetic attraction and repulsion 398 



Polarity of the magnet 401 



Dip of the needle 403 



Communicated magnetism 406 



ASTRONOMY 413 



