To maintain the health and energy of the apple-tree, the land should be enriched. This may be accomplished by the application of animal manures, chemical fertilizers, or cover-crops, or preferably by a combination of these means. Not many persons possess sufficient farm manures to supply the general crops and the apple-orchard; but every application the orchard receives is all to the good. Five to ten tons of good stable manure to the acre annually is a good addition for an orchard in bearing. This may be supplemented by cover-crops and bag fertilizers in years in which the manure is not available. Experiments are yet inconclusive on the fertilizing of apple-trees, but it is fair to assume that on most lands, particularly on old lands, the addition of chemical fertilizer is advantageous. A bearing apple-tree may receive two to eight pounds of nitrate of soda (depending on its size and on soil) applied to the full feeding area of the roots, five to nine pounds of acid phosphate, two or three pounds of muriate of potash; always ask advice. The pasturing of orchards is often defensible and sometimes even desirable. If the trees are growing too rapidly, they may be "slowed down" by seeding to grass for a time; and pasturing with hogs, and possibly with sheep, may afford a way of keeping the area in condition and of adding fertilizer. Sheep that do not have access to drinking-water and salt gnaw the trees. Hogs root up the ground and thereby provide a rude kind of tillage. If animals are fed other food in the orchard, the fertilizer increment will be considerable. In house-lot conditions, the apple-tree usually receives sufficient food if the land is well enriched for garden purposes; but trees in sod should have liberal top-dressings of fertilizer every year and of stable manure every other year. The apple-tree should have a good supply of moisture. Planted on banks and in hard places about buildings, it may suffer in this respect. The land should be so graded that the rainfall will not run off. In orchard conditions, the moisture is conserved by the addition of humus to the land, and by thorough judicious tillage; and in dry regions it is supplied by irrigation. The energy of the apple-tree, and its ability to produce, is conserved by holding all diseases and noxious insects in check. The means at the command of the apple-grower are now many. No longer is the man helpless, nor does he need to appeal to the moon or to "atmospheric influences" for reasons. The natural histories of fungi and insects, that do so much damage, are now a part of common understandable knowledge. To acquire at least a working understanding of the commonest of these subjects is in itself a great satisfaction and gives one a sense of dominion. The good books and bulletins are sufficient to keep one well informed. All these organisms are tenants of the apple-tree, and from the naturist's point of view alone they are not to be overlooked.