das Sciencias de Lisboa. 249 



( O-O' 0-4)' 0-0' 0-4)'\ / 0-0' 0-4)' 0-0' 0-4)'\ 

 U(0 Dciy-Dco #0) )P—\<<Xo -^CO-^CO Qo )dP=à 



/O -O' »' 0-0' i' \ /.(■-!> »' O -O' i' \ 



Uco ^co--Dco £(,yp— VQo Ao-^O) C^)jP=zo 



/(/i-O' 2' (n-i>2' \ / (rt-l)' a' (" -O' 2' \ 



Uco Dei)— -0(0 íco^P— VCco .0(0— #0) C(,)k=o 



/(«-O' »' 0-0' ■' \ /O -O' «' 0-0' ■' \ 

 U(.) D(.)--D(0 -BCO/P-VQO Ao— #(0 C(o/</P=o 



das quaes eliminando -p- fc deduzem as feguintes 



/ 0-0' 0-0' C-0'O-O'N 0-07 0-0' 0-0' O-0'O-jY\ 0-í> 



/ ( n - 2 y o-,)' O-*)' 0-i)'\ 0-0' 

 +U C -C B )D =0 



/ 0-0' 0-0' 0-0' 0-0'\ 0-4)'/ O-0'O-4)'O-0'O-4)A c»-»y 



Vfl c — c 2? ;z> — U c — c £ ;d 



/ 0_ 2 y („_ 4 y („_ 2 y ( n - 4 >\ („ - O' 



+\b c — c £ ;z> =0 



/ (n-0'(«-2)' (n-0' 0-0'\ 0-5)7 0-0'0-5)'0-0'0-5)'\ 0-0' 

 \B C -C B )D -\B C -C B )D 



( 0-0' 0-0' 0-0' 0-5)'\ 0-0' 

 +U c — c B )D =0 



/ 0-0' 0-0' 0-0'0-0'\ i' /O-O' i' 0-0' A Cn-aY 

 VP C -C B )D —\B C -C BÍD 



/ 0-0' 1' 0-0' i'\ 0-0' 

 +\B C —C B )D =0 



t 0-0' 0-0' 0-0' 0-0 \ 2 ' /O-O' 2' 0-0' *'\ 0-0' 

 U C -C B )D -U C -C B)D 



/ 0-0' a' 0-0' »'N 0-0' 

 -t-U C —C B JD = o 



/ 0-0 



r»«. 7/. Rrr (5 



