f 



9 t H I S T O I R E. 



{d®'\ i , _L^f__ v___) — rf^'K^Wfii!L'Vi^l(ii^ ' 



^O J J I V d j J ^ dj yV dx* / Ll o)/V,)^ ^d* A^ ^-IV dX ^/ 



■_> 



dx 



KWX^)] 



(-> 



/ d_ \ / <__ \ _ / __ ) /__ \ 

 K dj > \\qj JK dj /V - ^/ L ^dy J^^IT) "^^T^^VjJ 1 ^dxdj' 



(_^)(i-$-t) — (3_^)(__. y ) 

 (^)t(f|")(^)-C^ 



L 



fin.a$l±^; 1 /C+D]co£LC^±r)v C^ D] 

 ^dx / \a j /vdj- /^ d* a / L ^dj/^^/ ^d* / v d ■> / J v a*a j' 



/3S'\pfl"\/ 99(E" \ 



(-)M 



( :__ H i^ ) — ( i$.' ) ( — — ) 



* d y / * T * / v d * / v d .> / 



\ d * / ^j A dJ> A 3 X 2 / L ^d J J ^ d x_ J ^dxJ^dyJ^^dXdj' 



«i _- 



_+./_!' U3__ \/ __\ 



d* A dK A ^y / 



/ __ w <__ \ _ /__ \ / __ \ 



- f £ d|X_3 -(^XVj) ____________ 



fin.[(__) /C-r-D]cof.[( £*_) ,, C +D]_ 



§. 21. 



