344 ^''' Perchjal on the Purfuits 



moral afFeftions are elevated to fuperior degrees 

 of piety, towards the great Author of all that 

 is fair and good in the creation. Nor is modern 

 philofophy liable to the charges, which have 

 been thus contunneliouny brought againft it. 

 For, I trufl:, it has been conduced, on the prin- 

 ciples of genuine logicy by all its more diftin- 

 guifhed profeflbrs, who have been feduloudy 

 careful firfl; to eftablifh found premifes, and then 

 to deduce juft conclufions. 



The immortal Newton, from an appearance, 

 which we daily obferve, the fall of bodies to the 

 ground, afcended by patient invcftigation, and 

 by a regular gradation of evidence, to the great 

 law of gravity. And having afcertained this 

 general principle, he extended it over the uni- 

 verfe, explaining by it not only the phsenomena 

 of our globe, but the revolutions of the whole 

 planetary fyftem. By the fucceffive adoption of 

 the fame analytic and Jynthetic mode of reafoning, 

 he demonflrated his beautiful theory of light 

 and colours. Numberlefs other lubfequent dif- 

 coveries have been conduced on the fame fcien- 

 tific plan, as might be evinced by references to 

 the writings of our own and foreign philofophers. 



Even the chemifts have long fince deferted 

 their jargor? and myfterious conceits; and they 

 now carry on their refearches in a perfpicuous 

 and rational manner. That unknown principle 

 phiogifton, to which they referred To many opera- 

 tions 



