This bibliography was started with the idea of annotating the references but it was found that space would not allow this unless only a small minority of references was included. We have taken the alternative of including the majority of references and compiling an analytical index.The bibliography covers the years 1924 to 1929 inclusive, except that the psychological references are complete for all years. Time and space has not allowed us to cover foreign journals. It is too much to hope that some errors have not occurred but we believe that they are not many. We trust that the bibliography will be of use to other scientists as well as psychologists.The following journals have been used in the compilation of this bibliography. In the majority of cases the files are complete to the end of 1929.