Q 



A 43 



PREFACE. 



HPHE present work is a sequel to a publica- 

 tion by the writer, in the year 1851, enti- 

 tled " The Philosophy of the Mechanics of 

 Nature, and the source of Natural Motive- 

 Power." It is designed to eliminate and ar- 

 range in due order the rudimentary facts and 

 principles therein detailed, and to show their 

 harmony with the Laws that control the Material 

 Universe. 



This has necessarily involved further re- 

 searches into the origin of Molecular Forces, 

 of Gravitation, and also of Solar Light and 

 Heat, as immediate sources of Natural Motive- 

 Power. 



The results are now respectfully submitted to 

 the reader. 



PROVIDENCE, R.I., September, 1879. 



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