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objects we admire so much, as well as the panes of glass which are put into windows.     We had better begin at the beginning, so let us go into this out-of-door shed, where are such a number of large barrels.     What is this man doing? Mixing what seems like a big pudding in a trough. The principal ingredients of glass are this fine white sand, potash, saltpetre and red lead. They are put together in a crucible-- which is a sort of great jar, with the mouth at the side instead of the top-- and placed in a furnace. What a rush of hot air meets us as the man opens a door which leads to these furnaces! Before us towers a dark cone-shaped erection, with openings all around, through which can be seen the intense glow of the molten glass within. Opposite each of these openings is a crucible, and the spaces between are filled up with fuel. All around are men wielding long rods, with what look like globes of fire on the ends.     See the pretty glass jug! So gracefully shaped,