Games and exercises for mental defectives
A 1916 instructional manual by Hilda Alice Wrightson, published in Cambridge, Massachusetts by Caustic-Claflin, setting out games and physical exercises for teachers working with children classed as mentally defective. The plates are overhead floor diagrams printed in black on tan stock: grids of x marks, bold crosses, start lines, distances in feet, and a lozenge crossed by an S-curve.
