. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Aquariums; Goldfish. â a Chapter Thirteen Aquarium Plants rr Whether aquaria are kept for scientific study or for the enjoyment of the beautiful, aquatic plants will always be found a useful, if not indispensable, adjunct. The fact that plants give off oxygen under the influence of light has been mentioned at several other places in this volume, but the principle is so important that it would be difficult to over-emphasize it. Aquaria containing good plant growth may be tightly covered and if p
. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Aquariums; Goldfish. â a Chapter Thirteen Aquarium Plants rr Whether aquaria are kept for scientific study or for the enjoyment of the beautiful, aquatic plants will always be found a useful, if not indispensable, adjunct. The fact that plants give off oxygen under the influence of light has been mentioned at several other places in this volume, but the principle is so important that it would be difficult to over-emphasize it. Aquaria containing good plant growth may be tightly covered and if placed in a good light they will support a fair number of fishes, the life-giving oxygen in such an experiment being supplied almost exclusively by the plants. That the roots of healthy aquatic plants absorb the products of decomposition in the bottom of the aquarium is an established fact. When an aquarium has been established for some time, the sand has become a little dirty and the plants have spread so that the roots of some are against the glass, a close observation will show a condition similar to that pictured in Figure 158. The sand near the roots is dis- tinctly whiter than that beyond their reach. No arguments need be put forward to establish the aesthetic value of plant life in the household aquarium or the pool in summer. Without them no one could attempt to reproduce the effects of Nature. So well understood is the value of aquatic plants that aquarists are constantly on the lookout for any- thing new which might enhance the beautiful results already achieved. Occasionally something of real merit is Pjq i5g found. We are pleased to be able to Absorption by Plant Roots 1'^* several of these newer species here,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Innes, William T. (William Thornton),
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