OCR Text |
Show Water Hole Is Dry by Day. A curious form of wnter-hole 13 found In the deserts of western Australia, Aus-tralia, dry by day but yielding nn abundant aupply of water by night. The flow of water is preceded by weird hissing and sounds of rushing-air. rushing-air. On examining one It was found that the water supply occurred in a long, narrow trench, at the bottom of which was a thin plate of gneiss (a species of rock arranged In layers), -separated by a cavity from the main rock mass beneath. Apparently tho heat of the day causes this plate to expand In the form of a depression, in which the water retreats. When it cools and contracts at night it forces first air aad then water back into tha trench. |