rilEFACE. IX 



Stewart, another an alumnus of this University and pupil of 

 Playfair, and a third our present Lord Bector, selected, not 

 from any connexion whatever with our body, but as a testi- 

 mony to his talents and learning. 



No alteration has been made in any of these Tracts in 

 preparing them for this work, except changing the fluxional 

 for the differential notation. But the author has very carefully 

 gone through all the analytical processes, in order to make 

 sure that no error or oversight had occurred in investigations 

 conducted at different times and in various circumstances. 

 Hardly any were found, except typographical ones in former 

 publications. 



