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INTRODUCTION. XIX colored shades over the screen occasionally, by using the tinters, gives a sense of a brighter light. For large public exhibitions, the mixed jet lime-light is necessary, and is in common use, mostly in two lanterns, with the dissolving cock, for producing the dissolving views. A single lantern with automatic cut-off and glass slides produces an agreeable effect, and is much easier and cheaper. See Manual, page 168. The Mixed Jet can also be used to great advantage in educational institutions, where the gases are stored in gaso- meters, as recommended in the Sciopticon Manual, page 182. This makes available, at a moment's notice, the best light, and it can be used in the daytime, with such dark- ening of the windows as can easily be effected by shutters or curtains. The effects of the Concentric Jet, No. 2, is scarcely inferior to the mixed jet, and there is a great advantage in using it, wherever the house gas is within reach, because it is easier to manage, and because it is not at all dangerous. The Alcohol Burner, No. l,is somewhat more difficult to manage than either of the other forms of lime light, but is used to advantage where hydrogen or house gas is not easily obtainable. The Sciopticon with its oil lamp, rather than with its lime light, though less effective, continues to be the choice of the many, for its being always ready, easy to manage, and inexpensive to use; showing with great brilliancy and steadiness for hours without readjustments or annoy- ance, and without heating the oil or cracking the glass ; while to close an exhibition, we have no further care than to turn down the wicks. As a Home Influence, it is worthy of all praise. Without drudgery or delay it transforms the drawing room into an art gallery, where the family circle may pass their leisure