Page:The American Boy's Handy Book edition 1.djvu/90

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How to Stock a Marine Aquarium.
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quill has been inserted, and then filling the pot half full of powdered charcoal, sand, and gravel—the charcoal at the bottom, the sand next, and the fine gravel or coarse sand on top. This filter when in use should be hung over, but some distance above, an earthen-ware dish, and the water allowed to fall drop by drop, or in a small stream, from the pot to the dish, or the filter may be hung over the aquarium, and each drop of water as it falls will carry with it into the tank below particles of the purifying, life-giving oxygen gathered up on its journey through the air.

Fiddler Craba.
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