. Experiments with plants. Botany. 98 EXPEBIMMNTS WITH PLANTS glass ^ the direction which seems to you most advan- tageous for the main roots and side roots and the rootlets which spring from the latter ; begin the directly over one (or more) of the roots. Ex- clude light com- pletely by covering the glass with card- board or cloth. What direction do the side roots have when they burst out of the main root? Do they after- ward change this direction? If so, when? Do you think they solve the problem of direction in the best way? Are they guided in the direction they take by light, heat,
. Experiments with plants. Botany. 98 EXPEBIMMNTS WITH PLANTS glass ^ the direction which seems to you most advan- tageous for the main roots and side roots and the rootlets which spring from the latter ; begin the directly over one (or more) of the roots. Ex- clude light com- pletely by covering the glass with card- board or cloth. What direction do the side roots have when they burst out of the main root? Do they after- ward change this direction? If so, when? Do you think they solve the problem of direction in the best way? Are they guided in the direction they take by light, heat, moisture, food or gravity ? Light has been care- fully excluded. If it were heat, moisture or food that guided them, we should expect to find adjacent side 1A mixture of glue and whiting put on with a brush is excellent for mark- ing ; white paint will do, but dries inore slowly; yellow pencils for marking glass are Apparatus designed to test the behavior of side roots uDder the influence of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Osterhout, Winthrop John Van Leuven, 1871-. New York, The Macmillan company; London, Macmillan & co. , ltd.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisher, booksubjectbotany
