78 Mr. De Morgan on the General Equation of Curves, Sfc. 



The consequences of these formulae might be carried further, 

 but what has been here said may be sufficient to turn the 

 attention of elementary writers to this part of the subject. 

 Analogous formulas may be obtained for Surfaces of the Second 

 Degree, which will probably form the subject of a future 

 communication. 



AUGUSTUS DE MORGAN. 



