the same time, without excluding each 

 other ; the objection to which is only 

 derived from the resistance we meet with 

 to the touch, and is a prejudice that has 

 taken its rise from that circumstance, and 

 is not unlike the prejudice against the 

 Antipodes, derived from the constant ex- 

 perience of bodies falling, as we account 

 it, downwards 1 ." 



In connection with other problems 

 in light and vision Priestley refers to 

 information supplied to him by Michell 

 and quotes from some of the philosopher's 

 published astronomical papers where these 

 problems are considered. 



1 Op. at. pp. 392-3. As Professor Whittaker 

 has pointed out, Faraday's suggestion that "an 

 ultimate atom may be nothing else than a field of 

 force electric, magnetic and gravitational sur- 

 rounding a point-centre, is substantially the view of 

 Michell and Boscovich." History of the Theories of 

 Aether and Electricity (1910), p. 217. 



