448 THE INTELLECTUAL RISE IN ELECTRICITY. 



of the Atlantic and Pacific Oceans, and came back not 

 with the desired proof exactly, but with a useful chart ex- 

 hibiting the variation of the needle in many parts of the 

 world, and the general law of its phenomena 1 . 



*Brewster: Treatise on Magnetism. Edinburgh, 1836, p. 13. 



BALANCE'S TITLE; PAGE. 



NOTE. A curious illustration of the mixture of old and new ideas 

 cerning magnetism which existed at the end of the seventeenth centui 

 is found in the title page of Balance's "Traitte* de 1'Aiman," publish 

 in 1687, which is here reproduced in fac simile. 



