<^.i ) 58 ( Iff^- 



VI. x*d'z + (^ + ^')x' d' z + (i2.-{-6^'-^-^')x*d*z 



-{- a' X' d' y -\- (6 a' -\- y' ) X' d* y 

 + {6 ct' -\- ^y' -\-£' ) X d'y 

 + ( 2 7' -4- 2 e' -f- v)') </ <// =z o ; 



VII. X* d'y + (12 -i-a^x^^V-l-^s^^-i-pa+y)**'^'^ 



-4- ( 24 -[- 1 8 a -f- 6 y -4- -^^ '^V 

 -H (6 a -f- 6 y -f- 3 e -+- ^) ^'^ 

 4- (3 A-V/' :s H- f 9 p -+- ) .V' ^' 5; 



-f-(6p-{-65-i-3^+^)^'- = o;' 

 VIIL x'd'z-{~{i2-i-^')x'd'z-i-(2^-{-9(^'-\-^')x'd'z 

 -f- ( 24 -f- r 8 (3' -h 6 5' -i- ^') .V ^^ 5; 



►4- ( 6 (3' ^-h 6 5' -H 3 -^' -r- ^')d' z 

 ■-\- a' x' d" y -i- i 9 cc' -{- y' ) x' d' y 

 -'h ( 1 8 a' -f- 6 y' -f- e') Jr ^'jK 

 -}- ( 6 ct' -f- 6 y' 4- 3 e' -h V)') d^ y rr o ; 



IX. .vVj-f-( i6-l-a).v'^^-f-(72 -f- I 2 a -f- y ) a: V j' 



4-(9<5-f-36a -t- 8y-f-s)A-d"j 



-f- ( 24 -h 24 a -f- 1 2 y -t- 4. e -f- -y) ) rtf^j' 



-hp.vVs; ~h(i2 (3-f-o)xfl'5; 



-h(3<5pH- 8 5-h<^)-*-^'- 

 H-(24(3-h la^-h^^-hO^d-^^^K^o ; 



X, x*d'z-\-{i6-\-^>)x'd'z-+iis-+i2p-\-6')xWz 



4-(96-f-36(3'-h8 5'-f-<'}x^*z 



-h (24 -f- 24 (3' -i-- 1 2 (5' -f- 4^' -h 0') //* 5; 



-h a' Jf ' d''j' -h ( I 2 a' -f- y ' ) Jf </V 

 4-(36a'-h8y'-h£')-*'^'j 



•(24a'-h i2y'-ir^t'-\-y{)d'y~o. 



Fdda 



