. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 1366 PLANT-BREEDING PLATANUS types can be selected. It is thus important that the hybrids of the first generation sliould be inbred with their own pollen or with pollen of the hybrids of the same combination, and numerous individuals of the sec- ond generation obtained in which plants showing the desired combin
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 1366 PLANT-BREEDING PLATANUS types can be selected. It is thus important that the hybrids of the first generation sliould be inbred with their own pollen or with pollen of the hybrids of the same combination, and numerous individuals of the sec- ond generation obtained in which plants showing the desired combination of characters are more likely to be found. One of the most prominent characters of crosses is their extreme vigor, which is particularly marked in racial and specific hybrids where the parents are widely distinct in characters (Fig. 1845). In crosses of closely related sorts, which are reproduced bj'^ buds, cuttings, slips, etc., and which do not ordinarily remain true to type when propagated by seed, the increase in vigor is not commonly so marked. Sterility, which is a common character of hybrids of very distinct species and races, may prove a detriment in certain cases; but it is seldoiu that all of the hybrids of any combination are completely sterile, and in most instances of this sort complete fertility can probably be secured by selection. The improvements which can be secured by means of crossing are almost innumerable, and many of them, so far as we are informed, can be secured in no other way. Such is the production of fragrant varieties from odor- less types as has been accomplished in the case of pan- sies, and the blending and changing of colors of flowers and fruits. Increased hardiness and adaptability to growth in warmer climates might possibly be secured by simple selection through a long series of years; but they can doubtless be most quickly secured by crossing tender and hardy sorts or species, when plants can be obtained which possess these opposite q
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