laughed at by the girls of a boarding-school. What would now be thought
of the greatest chemist of 1746, or of the greatest geologist of
1746? The truth is that, in all experimental science, mankind is, of
necessity, constantly advancing. Every generation, of course, has its
front rank and its rear rank; but the rear rank of a later generation
occupies the ground which was occupied by the front rank of a former
generation.

You remember Gulliver's adventures. First he is shipwrecked in a country
of little men; and he is a Colossus among them. He strides over the
walls of their capital: he stands higher than the cupola of their great
temple: he tugs after him a royal fleet: he stretches his legs; and a
royal army, with drums beating and colours flying, marches through the
gigantic arch: he devours a whole granary for breakfast, eats a herd of
cattle for dinner, and washes down his meal with all the hogsheads of a
cellar. In his next voyage he is among men sixty feet high. He who, in
Lilliput, used to take people up in his hand in order that he might be
able to hear them, is himself taken up in the hands and held to the
ears of his masters. It is all that he can do to defend himself with his
hanger against the rats and mice. The court ladies amuse themselves with
seeing him fight wasps and frogs: the monkey runs off with him to the
chimney top: the dwarf drops him into the cream jug and leaves him to
swim for his life. Now, was Gulliver a tall or a short man? Why, in his
own house at Rotherhithe, he was thought a man of the ordinary stature.
Take him to Lilliput; and he is Quinbus Flestrin, the Man Mountain. Take
him to Brobdingnag, and he is Grildrig, the little Manikin. It is the
same in science. The pygmies of one society would have passed for giants
in another.

It might be amusing to institute a comparison between one of the
profoundly learned men of the thirteenth century and one of the
superficial students who will frequent our library. Take the great
philosopher of the time of Henry the Third of England, or Alexander the
Third of Scotland, the man renowned all over the island, and even as far
as Italy and Spain, as the first of astronomers and chemists. What is
his astronomy? He is a firm believer in the Ptolemaic system. He never
heard of the law of gravitation. Tell him that the succession of day and
night is caused by the turning of the earth on its axis. Tell him
that, in consequence of this motion, the pola