The Shell Book by Julia Ellen Rogers - Bookswagon
The Shell Book

The Shell Book


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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER II: THE BALANCED AQUARIUM AND THE SNAILERY A PRACTICABLE WAY TO STUDY MOLLUSKS ALIVE IN YOUR OWN HOME About fifty years ago a young lady up in Vermont took home from a pond a two-quart glass jar of water in which she had collected a few tadpoles, minnows and snails, and some of the growing pond-weed among whose leafy stems she found them. In her home she kept this happy family; the water did not stale and grow turbid; the animals and plants throve as if they were still in their native pond. The secret of her success was this. The leaves of submerged plants give out oxygen which gill-breathing animals obtain from the water. They take up the carbonic acid gas given off into the water by the animals. Each kind of living thing needs the very element that the other discards. Plants and animals "purify the water" for each other. This balance of Nature is a nice one. Too many animals or too many plants upset it. Fresh water aquaria are miniature ponds, tanks or jars stocked with animal and plant life brought in from ponds or streams. If properly "balanced," the water needs no changing but remains pure and sparkling as long as the equilibrium is maintained. This is the practicable aquarium for all who live inland. Marine, or salt water aquaria are feasible for all who live near the seashore. The law of balance holds here, too. The difference is that sea water is used, and seaweeds and the animal life of the ocean furnish the proper materials for stocking it. Inland, there have been some successful marine aquaria. But it is expensive to ship sea water by rail, and making artificial sea water presents many difficulties. The stocking of these aquaria is precarious business. Successful marine aquaria inland are rare. Public aquaria, like the great institution in Batt...


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Product Details
  • ISBN-13: 9780548071359
  • Publisher: Kessinger Publishing
  • Publisher Imprint: Kessinger Publishing
  • Height: 229 mm
  • No of Pages: 636
  • Series Title: English
  • Weight: 1146 gr
  • ISBN-10: 0548071357
  • Publisher Date: 25 Jul 2007
  • Binding: Hardback
  • Language: English
  • Returnable: N
  • Spine Width: 40 mm
  • Width: 152 mm


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