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the tenth of May, 1857, I became the glad possessor of a tank capable of holding thirteen or fourteen gallons of water. Its substantial frame of well-seasoned oak, its stout plank bottom, lavishly covered with cement, promised to resist alike the heat and dryness from without and the wet within. The sides and ends, of double flint-glass, seemed to invite the eye across their clearness. Its chosen site was at a south window, so shaded by a wing of the house as to receive only the morning sun for about two hours; and clustering vines overhung the window, so that the beams fell in checkered light. All was now ready.

A few fragments of white quartz were arranged in rude imitation of ocean recesses, and in their fissures were placed four or five small plants of Enteromorpha and Corallina. Sand was strewn upon the bottom, to the depth of two inches, and ten gallons of sea-water were then poured in. This had been brought from one of the wharves, at high tide, twenty-four hours previously, and twice drawn off with a siphon,—each time after twelve hours' rest. It was not, however, perfectly translucent, and at the end of a week was still cloudy. On the fifth day after the tank was filled, I began to introduce the animals to their future home. Ten Buccina were first put in possession, in the hope that they would perform the part of gardeners to the young plants. On the sixth day, seven Actinias were disposed upon the rock-work. On the seventh, a Horsefoot (or, as our Southern neighbors call it, a King-Crab, though of most unregal aspect) was allowed to make his burrow in the sand. On the eighth day, four Hermit and Soldier Crabs and two Sand-Crabs were invited to choose their several retreats. On the ninth, three fine Sticklebacks and three Minnows were made free of the mimic ocean; and on the tenth, an Eel and two Prawns.

All seemed well until the evening of the twelfth day, when a small white cloud was seen rising from the bottom. The spot was searched for some dead member of the new colony; but none was found, either there, or in any other part of the tank.

Supposing that the impure gas might be generated by the decay of minute creatures congregated in the cloudy corner, a lump of charcoal was tied to a stone and sunk upon the spot. Next morning, the cloud had cleared from around the charcoal, but slender wreaths of similar appearance were rapidly rising from the sand in every other part of the Aquarium. The fishes came oftener to