Who is the second member when RT Hon. Edward Stanley is the first member?
CREATE TABLE "m_ps_1707_1868" (
  "year" real,
  "first_member" text,
  "first_party" text,
  "second_member" text,
  "second_party" text
);
SELECT "second_member" FROM "m_ps_1707_1868" WHERE "first_member"='rt hon. edward stanley';