"I may mention that at the beginning our speed was between four and five knots an hour, but we hardly averaged more than about fifty knots a day. There was little wind to speak of. On the 8th we had a fair breeze, which sent us along a couple of knots faster. The speed of the current is, I am told, wholly regulated by the presence or absence of wind; but I give the normal time. As we rounded the south coast of Florida we encountered huge flocks of birds wending their way northward. Anything more placid and beautiful than the Gulf Stream at this point cannot be imagined. The water is a brilliant blue, like the Bay of Naples, while in the far distance may be seen the dark green of the ocean. The temperature of the water I ascertained to be seventy-four degrees Fahrenheit; that of the Atlantic could hardly have been above forty-five degrees. Off Bebini we observed a curious sight, which more than ever impressed the idea of a river on our minds, and this occurred several times in the course of our long trip. The presence of a stiff land breeze blew us out of the channel to the very edge of the Stream, whose boundaries were here as clearly marked as that of the Mississippi. Great quantities of driftwood and flotsam of all sorts, including canes and palm leaves, floated in a long, thin line extending for miles, forming natural banks to the world's greatest river. My mate took a photograph of this phenomenon, together with others, but, unluckily, in developing them later, all were more or less spoiled, although some idea may be got from the one showing the aspect of the Stream. We also observed numerous flying-fish, which, curiously enough, rarely, if ever, deviated from the path of the Stream, as if they were quite aware of its course and boundaries." [Illustration: DIAGRAM SHOWING THE COURSE OF THE GULF STREAM.] From this point the river flows straight to the north, pressing through the ocean with a width of nearly thirty-seven miles, and of an average depth of two hundred fathoms. The mass of water has been estimated at some forty-five millions of cubic yards a second. The mean discharge of the Mississippi is barely twenty-five thousand cubic yards. As the Gulf Stream expands and spreads in its northward and easterly course, its depth becomes proportionately less considerable. The strata of cold water which serve as its banks retire on each side and allow it more breadth. The cold bed of water which bears it, and over which it flows, as terrestrial rivers glide over beds of rocks, gradually approaches nearer the surface. Off Cape Hatteras the depth is about one hundred and twenty fathoms, and its speed does not exceed three miles an hour, but it is twice as wide as when it emerges from the Strait of Florida. Its width is here seventy-eight miles. Its thickness, of course, constantly diminishes until it is only a thin sheet of warm water on the other side of the Atlantic, and is gradually dissipated in the sub-Arctic sea.