This special re-print edition of O.F. Cook's book "The Superiority of Line Breeding Over Narrow Breeding" is a guide to the subject of line breeding and narrow breeding. Written in 1909 by one of the pioneers of genetic study in plants, this short overview of Cook's research into plant breeding will be of immense aid to breeders of not only plants, but also animal breeders of all types who are interested in the improvement of their breeding stock, be it for production or exhibition. Chapters include Three Principal Types of Reproduction, Improvement by Increase of Uniformity, The Most Effective Method of Linebreeding, Other Methods of Line Breeding, In-and-In Breeding, Broad Breeding and Line Breeding in the Same Species, How Selection Improves Line Breeding, Uniformity is Not a Normal Condition of Heredity, Two Forms of Mass Breeding Selection, The "running out" of Varieties, The Fixing of Characteristics by Line Breeding and more. This will be found to be a valuable resource to breeders of all types of domestic animals. Note: This edition is a perfect facsimile of the original edition and is not set in a modern typeface. As a result, some type characters and images might suffer from slight imperfections or minor shadows in the page background.