COORDINATES OF A CUBIC CURVE IN SPACE. 
381 
{(C, B, y, z), 
(A, B, y, x), 
(D, B, y, t), 
(A, B, y, t) + 2(L, B, y, x), 
(D, B, y, x) + 2(L, B, y, t), 
(C, B, y, <) + 2(M, B, y, z), 
(D, B, y, z) + 2(M, B, y,t), 
(C, B, y, x) + 2(G, B, y, z), 
(A, B, y, z) + 2(G, B, y, x), 
(L, B, y, z) + (N, B, y, x) A(G, B, y, t)}\z, x, tf 
{(A, C, z, x), 
(B, C, z, y), 
(D, C, z,t), 
(B ; C, z, t )+2(M, C, z, y), 
(D, C, z, 2 /)+ 2 (M, C, z, t), 
(A, C, z, 0 + 2(L, C, z, x), 
(D, C, z, x)-|-2(L, C, z, t), 
(A, C, z, y) + 2(H, C, z, x), 
(B, C, z, aj) + 2(H, C, z, y), 
(M, C, z, a:) + (L, C, z, y) + (H, C, z, £)}$>, y, tf 
{(A, D, t, x), 
(B, D, t, y), 
(C, D, *, z), 
(B, D, t, z) + 2(F, D, t, y), 
(C, D, t, y)+ 2(F, D, t, z), 
(C, D, t, x) + 2(G, D, t, z), 
(A, D, t, z)+2(G, D, t, x), 
(A, D, t, y) + 2(H, D, t, x), 
(B, D, t, x)+2(H, D, t, y), 
(F, D, <, x)+ (G, D, <, y) + (H, D, <, *)}£*, y, z) 3 
3 d 2 
