THE READER will find in 



Chapter XI. page .'./ . . 266 



XII. . .'-..,.. 269 



xiii. ' . . : . . . 279 



XIV. ...... 285 



passages which give an idea of the treatment of general views. 



At the end of each section (say Biology, or Geology, or Chemistry, etc.) 

 are to be found brief remarks of historical and philosophical importance. 



The march of a science can be traced from beginning to end in the 

 successive notices of its promoters. The whole progress of Electricity, 

 for instance, can be found in the notices on 



PAGE 



Gilbert .... VI. ' '. './ - 9 8 



Guericke . . . . . - . . . . 216 



Franklin . . . .... . 220 



Galvani and Volta . ..> 224 and 225 



Physicists ( Biot and Oersted . . . . . 230 and 232 



Faraday and Wheatstone . . . .236 and 240 



Steinheil 241 



Thomson ...... .. . . 253 



Crookes and Tesla 257 and 259 



