This volume is the outgrowth of over eight years experience in inter-mountain horticulture. From the nature of our work, much time has been spent in orchards in the various districts, and Mr. Whipple, in the capacity of Field Agent in Horticulture, has been stationed for the past three years at Grand Junction, Colorado, the center of one of the most famous fruit sections in the Union. During this time the writers have become acquainted with the many problems that are of interest to the experienced orchardist and most perplexing to the novice, through personal contact with fruit-growers and at horticultural short-courses as well as through correspondence. Arid horticulture is very different in many respects from that of the humid states, and a fruit-grower from the East has much to learn. But the majority of our fruit-growers had no experience in horticulture before coming West, and many of them had little or no knowledge of country life. Such persons have everything to learn, and it is to them that this volume is especially addressed. Horticulture has only begun to be developed in the semi-arid West; consequently new settlers will continue to come to us for many years, and instruction in the elements of the art of horticulture will continue to be in demand.