First Studies of Plant Life

First Studies of Plant Life

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 edition. Excerpt: ... of gas come out more rapidly on a sunshiny day than on a cloudy one. The more light there is, then, the more work the plant can do. This can be told in another way. Remove the bottle from the window and put it in a poorly lighted corner of the room. The gas is given off more slowly. Cover the bottle with dark cloth to shut out all light. In ten or fifteen minutes uncover it. The escape of the gas has ceased. Now place it in the brightly lighted window again. The bubbles soon start up afresh. Fig. 151. The " tell-tale" bubbles rising from a water plant. Do the "pond scums" do the same kind of work? Many of you have seen the green-looking "scum," as some people call it, which floats on the surface of ponds or on the water of ditches, and which is so abundant in the spring and autumn. This pond scum deserves a better name, for it is really made up of beautiful tiny plants, often consisting of silk-like threads, which we can see by lifting a bit of it from the water. To see that it does the same kind of work as the leafy water plant, place some in a bottle of water and set it in the window by the side of the other plants. The tell-tale bubbles show themselves here also. Now you have perhaps noticed that this pond scum, as it floats on the water, has a great many bubbles in it, caught in the tangle of threads. If you take up some of this tangle, rinse it in the water to remove all the bubbles, and then replace it in the water; it does not float well, but tends to sink to the bottom. But when the bubbles of gas begin to form again and are caught in the meshes of the tangle, they are so much lighter than water that they buoy up the plant and lift it once more to the surface of the water. Here the plant can get more light, ...show more

Product details

  • Paperback | 44 pages
  • 189 x 246 x 2mm | 95g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • Illustrations, black and white
  • 1236633768
  • 9781236633767