. Elementary principles of agriculture; a text book for the common schools. Fig. 75. Y-system of pruningand training Fig. 76. Munson system of training and trellising grapes. CHAPTER XIXPROPAGATION OF PLANTS 190. How Plants Propagate. Plants propagate natu-rally by seeds and by the formation of special parts.,which become separated and independent of the parentplant, as bulbs in onions, stolons or runners in straw-berries, tubers (thickened stems) in Irish potatoes, andby roots, as in the sweet potatoes, and in many otherspecial ways. These are natural methods of multipli-cation, and
. Elementary principles of agriculture; a text book for the common schools. Fig. 75. Y-system of pruningand training Fig. 76. Munson system of training and trellising grapes. CHAPTER XIXPROPAGATION OF PLANTS 190. How Plants Propagate. Plants propagate natu-rally by seeds and by the formation of special parts.,which become separated and independent of the parentplant, as bulbs in onions, stolons or runners in straw-berries, tubers (thickened stems) in Irish potatoes, andby roots, as in the sweet potatoes, and in many otherspecial ways. These are natural methods of multipli-cation, and take place without mans assistance. Oftenman provides the conditions which favor multiplicationin these ways. We have already mentioned the impor-tant conditions to be controlled in causing the embryoplants of sprouting seeds to grow. The other naturalprocesses of multiplication, i. e., by tubers, bulbs, etc.,are matters of every-day knowledge, and are used forpropagating a variety of plants. We speak of the formeras propagation by seedage, and the latter as propagationby division. 191. Seedage. In preparing land for se
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