2. To secure a sufficient number of fruit-bearing shoots, and in right locations, and to throw sufficient sap into those shoots to enable them to mature the fruit. With a certain amount of pruning, you may double the quantity of fruit, or destroy half that the trees would have produced if not trained at all. One half of the fruit of any orchard depends upon correct pruning. It also has a great influence upon the quality of fruit. The cherry is almost the only fruit-tree that throws out nearly the right number of branches, and in the right places. It needs a very little direction while young, and afterward only the removal of decaying branches. The quince needs considerable trimming at first; but, the head once formed, it will need very little after-pruning. Next comes the plum, needing, perhaps, a little more pruning than the cherry or quince, but much less than the other fruits. The plum is apt to throw out strong branches, in some directions, quite out of proportion with the rest of the top. Such need shortening in, to distribute the sap equally through the tree, and thus produce a symmetrical form. This is all the trimming necessary. The roots of a plum-tree are usually stronger than the top, and absorb more than the leaves can digest; hence some of its diseases. The natural remedy would be root-pruning, and leaving the top in its natural state, except shortening-in the disproportioned branches. Removing much of the top of a plum-tree would ordinarily prove injurious. The apple needs considerable pruning, but not of the spurs and side-twigs which bear the fruit, but of limbs that grow too thick, and of disproportioned luxuriance. (See under Apple.) So the pear must be often slightly pruned to check the too vigorous growth and encourage the too tardy. The peach must be so pruned as to prevent the long bare poles so often seen, and to secure annually the growth of a large number of shoots for next year's bearing, and to check the flow of the sap by cutting off the ends of the growing young shoots, so as to cause the formation on each, of a few vigorous fruit-buds. Peach-trees, so pruned, will be healthy and do well for fifty years, and produce a larger number of better peaches than will grow on trees left in the usual way. By a system of pruning that will equalize the growth and strength, the bearing will be general on all the branches of the tree. This will make the fruit more abundant and of better quality. The following six principles--first stated by M. Dubreuil, of France, and since presented to the American people in Barry's "Fruit-Garden," and still later in Elliott's "Fruit-Book"--will guide any attentive cultivator into the correct method of pruning and training:-- 1. The vigor of a tree, subject to pruning, depends, in a great measure, upon the equal distribution of sap in all its branches. 2. The sap acts with greater force, and produces more vigorous growth on a branch pruned short than on one pruned long.