Mental defect, mal-nutrition, and the teacher's appreciation of intelligence a reply to criticisms of the memoir on 'The influence of defective physique and unfavourable home environment on the intelligence of school children, ' This book, "Mental defect, mal-nutrition, and the teacher's appreciation of intelligence a reply to criticisms of the memoir on 'The influence of defective physique and unfavourable home environment on the intelligence of school children, '", by David Heron, is a replication of a book originally published before 1911. 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.