Men who study the stars tell us strange and wonderful things—things that the unlearned find it hard to understand, and harder still to believe, yet things that we are now as sure of as we are of the fact that two and two make four!

There was a time when men said that the sun moved round the earth; and very natural it was in men to say so, for, to the eye of sense, it looks as if this were really the case. But those who study the stars have found out that the earth moves round the sun—a discovery which has been of the greatest importance to mankind—though the importance thereof cannot be fully understood except by scientific men.

Among other difficult things, these astronomers have attempted to measure the distance of the sun, moon, and stars from our earth. Moreover, they have tried to ascertain the exact size of these celestial lights, and they have, to a considerable extent, been successful in their efforts. By their complicated calculations, the men who study the stars can tell the exact day, hour, and minute when certain events will happen, such as an eclipse of the sun or of the moon.

Now, about the year 1768 the attention of the scientific world was eagerly turned to an event which was to take place in the following year. This was the passage of the planet Venus across the face of the sun. Astronomers term this the Transit of Venus. It happens very seldom: it occurred in 1769, but not again till 1874, and 1882. By observing this passage—this transit—of Venus across the sun from different parts of our earth, it was hoped that such information could be obtained as would enable us to measure not only the distance of the sun from the earth with greater accuracy than heretofore, but also the extent of the whole host of stars that move with our earth around the sun and form what is called our Solar System.

An opportunity occurring so seldom was not to be lost. Learned men were sent to all parts of the world to observe the event. Among others, Captain Cook was sent to the south seas—there, among the far-off coral isles, to note the passage of a little star across the sun’s face—an apparently trifling, though in reality important, event in the history of science.

So much for the object of Cook’s first voyage. Let us now turn to the details thereof.

The vessel chosen by him for his long and dangerous voyage to unknown seas was a small one of only 370 tons burden. It was named the Endeavour. The crew consisted of forty-one seamen, twelve marines, and nine servants—these, with the officers and the scientific men of the expedition, made up a body of eighty-five persons.

The scientific men above mentioned were, Mr Green, an astronomer; Mr Banks, a naturalist, who afterwards became Sir Joseph Banks and a celebrated man; Doctor Solander, who was also a naturalist; and two draughtsmen, one of whom was skilled in drawing objects of natural history, the other in taking views of scenery.

The Endeavour was victualled for a cruise of eighteen months. She was a three-masted vessel of the barque rig, and carried twenty-two large guns, besides a store of small arms,—for the region of the world to which they were bound was inhabited by savages, against whom they might find it necessary to defend themselves.

When all was ready, Captain Cook hoisted his flag, and spread his sails, and, on the 26th of August 1768, the voyage began—England soon dropped out of sight astern, and ere long the blue sky above and the blue sea below were all that remained for the eyes of the navigators to rest upon.

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.

These Medusae, as they are called, have been spoken of by many travellers, who tell us that in some parts of the sea they are so numerous that the whole ocean is covered with them, and seems to be composed of liquid fire, usually of a pale blue or green colour. The appearance is described as being of great splendour. Even in the seas on our own coasts this beautiful light is often seen. It is called phosphoric light. Something of the same kind may be seen in the carcass of a decaying fish if taken into a dark room.

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