Heredity in Relation to Eugenics is a book by American eugenicist Charles Benedict Davenport, published in 1911. This book was a best-seller and very respected when it was published. It was printed and published with money and support of the Carnegie Institution.
Along with its obvious racism, the book has many failures in genetic studies. It claims that hysteria, night blindness, psoriasis, chlorosis, goitre, etc. were produced by genetic causes.
In its time, the book was a success and was used as textbook in dozens of medicine courses of United States and many other English-speaking countries. It remains the most-sold book written by Charles Benedict Davenport.