Recall of Words, Objects and Movements: Harvey A. Peterson ... 207
Mutual Inhibition of Memory Images: Frederick Meakin ......... 235
Control of the Memory Image: Charles S. Moore ................ 277

STUDIES IN ÆSTHETIC PROCESSES.

The Structure of Simple Rhythm Forms: Robert MacDougall ...... 309
Rhythm and Rhyme: R.H. Stetson ............................... 413
Studies in Symmetry: Ethel D. Puffer ......................... 467
The Æsthetics of Unequal Division: Rosewell Parker Angier .... 541

STUDIES IN ANIMAL PSYCHOLOGY.

Habit Formation in the Crawfish, Camburus affinis: Robert
M. Yerkes and Gurry E. Huggins ............................. 565
The Instincts, Habits and Reactions of the Frog: Robert
Mearns Yerkes .............................................. 579

STUDIES IN PSYCHOLOGICAL THEORY.

The Position of Psychology in the System of Knowledge:
Hugo Münsterberg ........................................... 641



PLATES.

OPPOSITE PAGE
Plate I ....................................................... 20
" II ....................................................... 24