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Higher up in the scale of life we get many instances which show various stages in the same progressive development towards greater care for the safety and education of the young. Among the larger lizards, for example, a distinct advance may be traced between the comparatively uncivilized American alligator and his near ally, the much more cultivated African crocodile. On the banks of the Mississippi, the alligator lays a hundred eggs or thereabouts, which she deposits in a nest near the water's edge, and then covers them up with leaves and other decaying vegetable matter. The fermentation of these leaves produces heat and so does for the alligator's eggs what sitting does for those of hens and other birds: the mother deputes her maternal functions, so to speak, to a festering heap of decomposing plant-refuse. Nevertheless, she loiters about all the time, like Miriam round the ark which contained Moses, to see what happens; and when the eggs hatch out, she leads her little ones down to the river, and there makes alligators of them. This is a simple and relatively low stage in the nursery arrangements of the big lizards.

During the Numantine war Rome was menaced by a new danger, which revealed one of the plague-spots in the Republic. We have already had occasion to describe the decay of the free population in Italy, and the great increase in the number of slaves from the foreign conquests of the state.[59] As slaves were cheap, in consequence of the abundant supply, the masters did not care for their lives, and treated them with great barbarity. A great part of the land in Italy was turned into sheep-walks. The slaves were made responsible for the sheep committed to their care, and were left to supply themselves with food as they best could. It was an aggravation of their wretched lot, that almost all these slaves had once been freemen, and were not distinguished from their masters by any outward sign, like the negroes in the United States. In Sicily the free population had diminished even more than in Italy; and it was in this island that the first Servile War broke out.

This boat was 72 feet in length, and her greatest height was 12 feet, while the greatest breadth was 8 feet, tapering off to points at the end. Capt. Murray Sueter in his book on submarines gives these and other particulars of the vessel. At either end the boat had a cabin, the air in which remained good for about three hours, and in the middle of the boat was a large paddlewheel rotated by clockwork mechanism, which, it was claimed, would run for eight hours when once wound up. The iron tips at the ends of the vessel were intended for ramming, and the inventor was confident he could sink the biggest English ship afloat by crushing in her hull under water. The boat was duly launched, but on trial of the machinery being made the paddlewheel, though it revolved in air, would not move in the water, the machinery being not powerful enough. This, says Capt. Sueter, was apparently the only reason for de Son's failure, for his principles were distinctly sound, and he was certainly the first inventor of the mechanically propelled semi-submarine boat. After her failure de Son exhibited her for a trifle to any casual passer-by.

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