The object of agriculture is the profitable production of useful plants and animal. Success in agriculture depends upon ability to manage men and things to take advantage of local conditions, knowledge to produce plants and animals and skill to transforming this knowledge into practice. This book is aimed to present the fundamental principles of agricultural chemistry. The point of view is that of the chemist dealing with agricultural problems; the attempt is made to emphasize chemical methods of investigations and inclate scientific habits of through. Practical applications, which are necessarily local, are left out as much as possible. Soil organisms, The nutritive value of proteids and productive value of feeds are included. This books gives a comprehensive view of the subject, and to prepare the student for a more detailed study of its various phases.