【實用書籍app】A Trip to Mars|最夯免費app-綠色工廠好玩App

n the case of my former book—my first written for young readers—I inserted a preface stating at some length my reasons for taking up the writing of stories of the kind. In it I pointed out that I had endeavoured to

combine amusement with a little wholesome instruction; and that what might at first sight appear to be mere irresponsible flights of fanciful imagination had, in reality, in all cases some quasi-scientific foundation.

Doubtless such a preface is unusual in a work of fiction, and even more so in one intended chiefly for boys; but the result proved that its intention was understood and appreciated. I should show myself ungrateful indeed

if I omitted, at the first opportunity, to record my deep sense of the kindly sympathy and approval with which that preface and the whole book were received by those reviewers—and they were many—who favoured my

work with a notice.

In this, my second attempt in the same direction, I am conscious that I have set myself a difficult task, for it is not an easy matter to give verisimilitude to a story of a visit to another planet about which we necessarily

know so little. Yet astronomy as a study is so fascinating, its mysteries and possibilities are so wonderful, so boundless, its influences so elevating and ennobling, that little apology is needed for any effort to attract the

attention of youthful readers to it by making it the subject of a romance.

Amongst other difficulties the story-writer here meets with, by no means the least confronts him when he is called upon to decide which of various theories put forward by different scientists he shall adopt as a starting-

point. Mars, for instance, may have an atmosphere which is like ours, or one that is either thinner or denser, or it may have no atmosphere at all. As to this nothing is known with certainty, and the most learned authorities

differ one from another. In these circumstances, I have adopted the supposition which seems best suited to my story—namely, that the air there may be denser than it is on the surface of our globe; but I do not wish to be

understood as asserting it as a fact. The same remark applies to the assumption that diamonds or other precious stones do not exist naturally in Mars. In regard to these two points, I have felt it may be allowable, as

children say, to 'make believe' a little in forming a groundwork upon which to build up a story. As to the rest, I have refrained, in deference to the known prejudices of young people, from interjecting constant scientific

explanations in the course of the narrative. Only sufficient has been introduced here and there to justify the hope that none will sit down to its perusal without getting up a little the wiser.

We are all of us, as Sir Isaac Newton so aptly yet reverently expressed it, 'only as children picking up pebbles on the seashore while the great ocean of knowledge lies stretched out before us.'

I shall be well satisfied if, in addition to affording pleasure to youthful readers, I enable them to pick up incidentally even so much as a few grains of the sand which lies beside the pebbles upon that wondrous, glorious