It is a wonderful thought, when we come to consider it, the idea of _going to sea_! To sailors who are used to it, the thought, indeed, may be very commonplace, and to lazy minds that are not much given to think deeply upon any subject, the thought may not appear very wonderful; but it is so, nevertheless, to us, men of the land, when we calmly sit down and ponder the idea of making to ourselves a house of planks and beams of wood, launching it upon the sea, loading it with food and merchandise, setting up tall poles above its roof, spreading great sheets thereon, and then rushing out upon the troubled waters of the great deep, there, for days and nights, for weeks and months, and even years, to brave the fury of the winds and waves, with nothing between us and death except a wooden plank, some two or three inches thick! It seems a bold thing for man to act in this fashion, even when he is accustomed to it, and when he knows all about the sea which he sails over; but when, like Cook, he knows very little about the far-off ocean to which he is bound, his boldness seems and really is, much greater. It is this very uncertainty, however, that charms the minds of enterprising men, and gives interest to such voyages. The Bible says, "They that go down to the sea in ships, that do business in great waters; these see the works of the Lord, and His wonders in the deep." Navigators in all ages have borne testimony to the truth of this. The very first pages in Cook's journal mention some of these wonders. He says that, while they were off the coast of Spain, Mr Banks and Dr Solander, the naturalists, had an opportunity of observing some very curious marine animals, some of which were like jelly, and so colourless that it was difficult to see them in the water except at night, when they became luminous, and glowed like pale liquid fire. One, that was carefully examined, was about three inches long, and an inch thick, with a hollow passing quite through it, and a brown spot at one end, which was supposed to be its stomach. Four of these, when first taken up out of the sea in a bucket, were found to be adhering together, and were supposed to be one animal; but on being put into a glass of water they separated and swam briskly about. Many of them resembled precious stones, and shone in the water with bright and beautiful colours. One little animal of this kind lived several hours in a glass of salt water, swimming about with great agility, and at every motion displaying a change of colours.