Letter from Lord Ponsonby to Henry John Temple, third Viscount Palmerston, concerning Palmerston's instructions, the British fleet in the Dardanelles, Russian plans for Turkey, resting the Caucasus and the Crimea from Russian control, the prospects of war between the Sultan and Mehemet Ali, David Urquhart wants to be secretary of legation, an idea for using a house of the Sultan's for the embassy residence, payment for Vogorides and McGuffog, a new treaty with Turkey to supersede all the earlier ones, British policy for the East, and a conciliatory message from the Russian minister