On the figure of the EARTH. 317 



c' X^ f ' x' : rr c' x'' 



3.2^* 5.8 rt^ ■^ J. 16 a ^ 



* .9 



+ — -^g-^x 35^" + i5^*'^' + 9^'d* + sd% &c. and 



by fubftituting for x its value ■ , ^ - or — . 



Vrt' + c' 



z= 



fl rt f fl f — a c 



b i.%b^ 5.8/^' '^ y.i^b^ ^ 



a'c' 



+ — ^g-;^x 35«'+ iS'^''^' + 9'^'^' + 5 A &c. again 



• i A' + d' f 

 ■y = — V -^ f-' 



"Which thrown into a feries becomes, 



2 C be ibC I2Q C 



v/?:=7=f_il_2l — i_ — ^, &c. 



The former of which being divided by the latter be- 

 comes, 



ac' ' 8 



^X3c' — d' + --^ xsc' — 2c'd'+d' 

 c \b c -^ 



a'/ 



+ -7«T7X 35^' --i5^^^' + 9^'^' — 5A &c. which 



being multiplied by — is 



(2*y'r a' y* y r jt a* / y 



2f* ' 8^' -^ ^ 16 r'^ 



77 J '^ J' .y 



the fluent of which is 



Vol. V. T t 



-=> + fl^+j^X3^'-'/' + ~=^X5^*— •^'+^* 



