The movements and reactions of fresh-water planarians a study in animal behaviour This book, "The movements and reactions of fresh-water planarians a study in animal behaviour", by Raymond Pearl, is a replication of a book originally published before 1903. 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.