252 
MR. LUBBOCK’S RESEARCHES 
+ { - j — jecos(£ — 2y) + j-i- + i-j ecos (a: + 2t/) 
[ 65 ] ~ [ 66 ] 
+ 1 2 - A | e cos (2 t - x - 2 y) 
[ 67 ] 
+ +y}ecos (2t + x-2y) + j e,cos(z-2^) 
[ 69 ] [ 71 ] 
+ — -|-}e,cos(z + 2 y) + + i-| e ; cos(2f~ r - 2?/) 
[ 72 ] 
[ 73 ] 
+ { — ^ i" } e ' cos (2 « H- 2 — 2 y) |i- + -|- + _L j e 2 cos (2 a; - 2 y) 
[ 75 ] [ 77 ] 
+ |i- + i. + -|-|e 2 cos(2a:+ 2y) 
[ 78 ] 
+ {-g — cos ( 2 t ~ 2 x ~ 2 y) + { 4 "”t + 1 - } e ' cos ( 2< + 2 x ~ 2 y) 
[ 79 ] 
[ 81 ] 
+ {t + T"T ~\}^^(x + z-2y) 
[ 83 ] 
+ {j+^-^-^}ee l cos(x + Z + 2 y) 
[ 84 ] 
+ {4--T + ±-~}ee,cos(2t- X -z-2y) 
[ 85 ] 
+ |-|---|- + -|>--|-}ce < cos(2i + ap + « + 2y) 
[ 87 ] 
+ {“T“T + T + 4 } ee ' cos( * _2-2y) 
[ 89 ] 
+ {-T“T + T + x } ee ' cos(x - 2 + 22/) 
[ 90 ] 
+ {-T + T“T + i }*e l co S (2t-x + z-2y 
[ 91 ] 
+ {-4 + |-| + -i-}ee ( cos(2f+x- 2 -2, 
[ 93 ] 
