Tommy.—Indeed, sir, I begin to think that I am not so much better than others, as I used to do.
Mr Barlow.—The more you encourage that thought the more likely you are to acquire real superiority and excellence, for great and generous minds are less exposed to that ridiculous vanity than weak and childish ones.
A few evenings after this conversation, when the night was remarkably clear, Mr Barlow called his two pupils into the garden, where there was a long hollow tube suspended upon a frame. Mr Barlow then placed Tommy upon a chair, and bade him look through it, which he had scarcely done when he cried out, "What an extraordinary sight is this!" "What is the matter?" said Mr Barlow. "I see," replied Tommy, "what I should take for the moon were it not a great many times bigger, and so near to me that I can almost touch it." "What you see," answered Mr Barlow, smiling, "is the moon itself. This glass has indeed the power of making it appear to your eye as it would do could you approach a great deal nearer; but still it is nothing but the moon; and from this single experiment you may judge of the different size which the sun and all the other heavenly bodies would appear to have, if you could advance a great deal nearer to them."
Tommy was delighted with this new spectacle. The moon, he said, viewed in this manner, was the most glorious sight he had ever seen in his life.
"And I protest," added he, "it seems to be shaded in such a manner, that it almost resembles land and water." "What you say," answered Mr Barlow, "is by no means unreasonable. The moon is a very large body, and may be, for ought we know, inhabited like the earth."
Tommy was more and more astonished at the introduction of all these new ideas; but what he was particularly inquisitive about was, to know the reason of this extraordinary change in the appearance of objects, only by looking through a hollow tube with a bit of glass fixed into it. "All this," replied Mr Barlow, "I will, if you desire it, one day explain to you; but it is rather too long and difficult to undertake it at the present moment. When you are a little farther advanced in some of the things which you are now studying, you will comprehend me better. However, before we retire to-night, I will show you something more, which will perhaps equally surprise you."
They then returned to the house, and Mr Barlow, who had prepared everything for his intended exhibition, led Tommy into a room, where he observed nothing but a lantern upon the floor, and a white sheet hung up against the wall. Tommy laughed, and said he did not see anything very curious in all that. "Well," said Mr Barlow, "perhaps I may surprise you yet, before I have done; let us at least light up the lantern, that you may see a little clearer."
Mr Barlow then lighted a lamp which was within the lantern, and extinguished all the other candles; and Tommy was instantly struck with astonishment
to see a gigantic figure of a man, leading along a large bear, appear upon the wall, and glide slowly along the sheet. As he was admiring this wonderful sight, a large monkey, dressed up in the habit of a man, appeared and followed the bear; after him came an old woman trundling a barrow of fruit, and then two boys (who, however, were as big as men) that seemed to be fighting as they passed.
Tommy could hardly find words to express his pleasure and admiration, and he entreated Mr Barlow in the most earnest manner to explain to him the reason of all these wonderful sights. "At present," said Mr Barlow, "you are not sufficiently advanced to comprehend the explanation. However, thus much I will inform you, that both the wonderful tube which showed you the moon so much larger than you ever saw it before, and this curious exhibition of to-night, and a variety of others, which I will hereafter show you, if you desire it, depend entirely upon such a little bit of glass as this." Mr Barlow then put into his hand a small round piece of glass, which resembled the figure of a globe on both sides. "It is by looking through such pieces of glass as