Acknowledgment is due to the expert writers of United States government and state experiment station bulletins from which much practical information has been gained by the author; to the boys and girls who wrote for this book the stories of their success in several kinds of outdoor industry; to Dr. Burton N. Gates, State Inspector of Apiaries in Massachusetts, and Prof. James E. Rice of the Department of Poultry Husbandry at Cornell University for reading the chapters on their specialties and for numerous suggestions which make those chapters valuable; and to many others from whom helpful ideas have come in letters.