19 



Let e and y be proper fraftions of which e is the greater ; then 

 will I + f be the greater number, and i +j the leffer : alfo let n be 

 the greater denominator, and m the leffer : 



By fuppo- 



Ction 



By prop, 

 znd. 



By lem- 

 ma 3d. 



» + 3 - 

 « +4 



; « J m 



I + e =1 -\- y 



Log. of I + f : Log. of I +;-::»: «. 



^-^™_ I . 7T>"- I • : Log. of I + ^ : Log. of i +y 

 :^-^- _ , . 7+^ " _ , : : Log. of i + * : Log. of i + y 



