Fruitless Attempts to penetrate through the Ice to the north-
west. Dangerous Situation of the Discovery. - Sea-horses
killed. Fresh Obstructions from the Ice. Report of Da-
mages received by the Discovery. - Captain Clerke's Deter-
mination to proceed to the Southward. Joy of the Ships'
Crews on that Occasion. Pass Serdze Kamen. Return
through Beering's Straits. Inquiry into the Extent of the
north-east Coast of Asia.- Reasons for rejecting Muller's
Map of the Promontory of the Tschutski. Reasons for be-
lieving the Coast does not reach a higher Latitude than 7010
north. General Observations on the Impracticability of a
north-east or north-west Passage from the Atlantic into the