None such are in fact required, for the car itself contains air enough for the use of its passengers for a quarter of an hour, and there is rarely occupied more than a period of two or three minutes to pass it through the surf to the shore.

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5

Areas being as the squares of homologous lines, the ratio would be, mathematically expressed, 1²: 4 × 12² = 1: 4 × 144 = 1: 576.

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6

There are nine of these presses in the printing-rooms of Harper and Brothers, all constantly employed in smoothing sheets of paper after the printing. The sheets of paper to be pressed are placed between sheets of very smooth and thin, but hard pasteboard, until a pile is made several feet high, and containing sometimes two thousand sheets of paper, and then the hydraulic pressure is applied. These presses cost, each, from twelve to fifteen hundred dollars.

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7

The principle on which these life-boats are made is found equally advantageous in its application to boats intended for other purposes. For a gentleman's pleasure-grounds, for example, how great the convenience of having a boat which is always stanch and tight—which no exposure to the sun can make leaky, which no wet can rot, and no neglect impair. And so in all other cases where boats are required for situations or used where they will be exposed to hard usage of any kind, whether from natural causes or the neglect or inattention of those in charge of them, this material seems far superior to any other.

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8

Continued from the June Number.

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9

Continued from the June Number.

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10

Continued from the June Number.

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11

Transactions of the Zoological Society.

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12

Josephine might afterward have fulfilled this promise, had not Madame d'Aiguillon been a divorced wife, which excluded her from holding any situation about the Empress.

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