Not only do we need to know what agriculture is, but the relative importance of its parts". The Principles of Agriculture is an extensively comprehensive handbook covering absolutely everything necessary for success in agriculture, written by one of the most knowledgeable practitioners of his time: Liberty Hyde Bailey. This text starts by outlining the intrinsic roles of science and business in agriculture, going on in a logical order to set forth the skeleton of the subject to be used by a teacher in agricultural education. A seminal piece on agriculture, this scarce text will appeal to those interested in the evolution of modern agriculture and constitutes a must-have for collectors of Bailey's work. American-born Liberty Hyde Bailey was a prolific horticulturist and botanist who wrote extensively on both topics. Originally published in 1897, we now proudly republish this scarce classic with an additional biography of the author.