And the singular appearance of the ocean, thickly matted over with gulf-weed, caused great alarm among his companions, who thought they had reached the limits of navigation.
A current of a character similar to the Gulf Stream only not so strong is experienced along the east coast of Africa, from Mozambique to the Lagullas Bank, off the Cape of Good Hope.

This current is undoubtedly caused by the trade wind forcing the water towards the coast of Africa.
But in this case it is not driven into a narrow passage, like the Gulf of Florida, which would greatly increase its velocity.

The temperature of the water in the current off the Cape of Good Hope is also several degrees higher than the ocean waters in the neighborhood of the current.
On the afternoon on which we entered the Gulf Stream the wind hauled suddenly to the eastward, and the heavens were obscured by clouds.

The breeze also increased, and the sea became rough, causing the brig to assume various unseemly attitudes, and perform gymnastic exercises wonderful to behold.

As the wind increased and the sea became more turbulent, the Dolphin tumbled about like an elephant dancing a hornpipe, insomuch that it was difficult for a person to keep his perpendicular.