In the Eastern and Southern States, and on the west coast, the commercial fertilizers have been used freely in with continued culture. The result has been that the expression "Fertilizer sick" has come into use. The evident trouble in such cases is lack of humus in the soil and a changed mechanical condition of the soil. What is needed is a mingling of the humus and nitrogen of cover-crops, and a judicious application of potash and phosphoric acid. Even on the rich prairie lands of the West the soil is deficient in potash. After an orchard has borne repeated crops, and the spread of tops does not favor the sowing of catch-crops, the free use of barn-yard manure is advisable at least once in four years. The summary that will apply to all soils and all parts of the Union is that the orchard must have humus in the soil from cover-crops or manure, with an ample supply of nitrogen, potash, and phosphoric acid.