Therefore, it is not the variety (that is, the top) that is wanted in the raising of these numerous plants, but merely the roots, on which desired varieties may be grown by the clever art of graftage. Yet not even all the roots may be wanted, for the growing plants may differ or vary in their stature and vigor as well as in their fruit. The discriminating grower, therefore, discards the weak and puny treelings at the digging time; or if the weak plants seem still to have promise, they may be allowed to grow another year before they are dug for the grafting. This digging time is the autumn of the first year, when the plants have grown one season. They are then to be used as "stocks" on which to graft Baldwin, Winesap or other varieties. The growing of these apple stocks is a business by itself. Formerly, most of the stocks used in North America were imported from France, where special skill has been developed in the growing of them and where the requisite labor is available. But now the stocks are grown also in deep rich bottom lands of the Middle West, as in Kansas, where, in the long seasons, a large growth may be attained. The methods of graftage of the commercial apple-tree are two--by cion-grafting whereby a bit of wood with two or three buds is inserted on the stock, by bud-grafting (budding) whereby a single bud with a bit of bark attached is inserted under the bark of the stock. Cion-grafting is practiced in winter under cover. The stock is cut off at the crown and the cion spliced on it, or the root may be cut in two or more pieces and each piece receive a cion. The union is made by the whip-graft method (Fig. 16). The cion is tied securely, to keep it in place. The piece-root method is allowable only when the root is long and strong, so that a well-rooted plant results the first year. The cion is a cutting of the last year's growth (as of No. 1, in Fig. 14). However accomplished, the process is to supply the cion with roots; it is planted in another plant instead of in the ground. [Illustration: 16. The whip-graft before tying.] The cion-grafts are now planted in the nursery row in spring. The cion starts growth rapidly, only one shoot being allowed to remain; this shoot forms the trunk or bole of the future tree. At the end of the first season, the little tree is said to be one year old, although the root is at least two years old; at the end of the second year it is two years old; the tree is sometimes sold as a two-year-old, but usually a year later as a three-year-old having a four-year-old root. In fact, however, the root and top may be considered, in a way, to be of the same age, particularly if only a piece of the root is employed, for the cion grew on its parent tree the same year the root was growing in the nursery.