1. A theory of learning and transfer: I

   • Harold Gulliksen
   • Dael L. Wolfle

   OriginalPaper Pages: 127 - 149

2. The unit hierarchy and its properties

   • Cyril Burt

   OriginalPaper Pages: 151 - 168

3. Contribution to the mathematical biophysics of error elimination

   • Herbert D. Landahl

   OriginalPaper Pages: 169 - 180

4. The orthogonal transformations of a factorial matrix into itself

   • Walter Lederman

   OriginalPaper Pages: 181 - 187

5. A method for finding the inverse of a matrix

   • Ledyard R. Tucker

   OriginalPaper Pages: 189 - 197

6. Announcement

   Announcement Pages: 198 - 198