Effects of hookworm disease on the mental and physical development of children. This book, "Effects of hookworm disease on the mental and physical development of children. Volume 2", by Edward K. Strong, is a replication of a book originally published before 1916. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.