does not commence much before September, and in the
meantime the tail of the Gulf Stream would still be
wearing a channel in the ice towards the pole; so, however
unpromising might be the prospect, I determined, at all
events, that we should go and see for ourselves how
matters really stood.

But I must explain to you why I so counted upon the
assistance of the Gulf Stream to help us through.

The entire configuration of the Arctic ice is determined
by the action of that mysterious current on its edges.
Several theories have been advanced to account for its
influence in so remote a region. I give you one which
appears to me reasonable. It is supposed, that in obedience
to that great law of Nature which seeks to establish
equilibrium in the temperature of fluids,--a vast body
of gelid water is continually mounting from the Antarctic,
to displace and regenerate the over-heated oceans of the
torrid zone. Bounding up against the west side of South
America, the ascending stream skirts the coasts of Chili
and Peru, and is then deflected in a westerly direction
across the Pacific Ocean, where it takes the name of the
Equatorial Current. Having completely encircled Australia,
it enters the Indian Sea, sweeps up round the Cape of
Good Hope, and, crossing the Atlantic, twists into the
Gulf of Mexico. Here its flagging energies are suddenly
accelerated in consequence of the narrow limits within
which it finds itself compressed. So marvellous does
the velocity of the current now become, so complete its