Publisher's Synopsis
Excerpt from The Plant World, Vol. 18
When the mercury falls the experiment is ended. If it is desirable, as it generally is, to repeat the test, and if there are no air bubbles in the bottom of the soil container, it can be done in one of two ways. Either the soil can be removed and the test begun anew, as must happen should air be found in the bottom of the container, or the following manipulation can be resorted to. Water is immediately run into the container and the soil is run through with a glass rod, after which the water is turned off and the position of the mercury noted and its rise observed as before. This operation can usually be repeated several times before the collection of air bubbles in the bottom of the soil compels the termination of the test.
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