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Lessons on Soil

Lessons on Soil


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About the Book

Excerpt: ...soil experiments. Take two small flasks of equal size fitted with corks and joined by a glass tube bent like a U with the ends curled over. Put some lime water into each flask and a little water in the U-tube. Now make a small muslin bag like a sausage: fill it with moist fresh garden soil, tie it up with a silk thread and hang it in one of the flasks by holding the end of the thread outside and pushing in the cork till it is held firmly (see Fig. 28). Fix on the other flask, and after about five minutes mark the level of the liquid with a piece of stamp paper; leave in a warm place but out of the sun. 61 In one or two days you will see that the water in the U-tube has moved towards the soil flask, showing that some air has been used up by the soil; further, the lime water has turned milky. But in the other flask, where there is no soil, the lime water remains quite clear. This proves, then, that some of the tiny creatures want air just as much as we do. The air readies them through passages in the soil, through the burrows of earthworms and other animals, or by man's efforts in digging and ploughing. Fig. 28. A bag of soil is fixed into a flask containing lime water. In a few days some of the air has been used up, and the lime water has turned milky Now try the experiment with very dry garden soil: little or no change takes place. As soon as you add water, however, breathing begins again, air is absorbed and the lime water turns milky just as before. Water is therefore wanted just as much as air. If you had very magnifying eyes and could see things so enlarged that these little creatures seemed to 62 you to be an inch long, and if you looked down into the soil, it would seem to you to be an extraordinarily wonderful place. The little grains of soil would look like great rocks and on them you would see creatures of all shapes and sizes moving about, and feeding on whatever was suitable to them, some being destroyed by others very much larger than...


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Product Details
  • ISBN-13: 9781153758659
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 36
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1153758652
  • Publisher Date: 01 Aug 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 82 gr


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