25 



a 



EXPERIMENTAL PSYCHOLOGY. 



In Charge of J. McK. Cattell. 



1. Set of diagrams for fluttering heart delusions. 



2. Two Disks of Kirschmann's Design : one showing a grada- 



tion from black to white in geometrical series ; the other 

 showing gradation in arithmetical series. 



3. Microphonic Receiver and Writing Point, such as was 



used by Binet and Henri. 



4. Plaster Mask with Specimen Tracings, showing eye and 



hand pulses and respiration. 



Nos. I, 2, 3 and 4 exhibited by E. C. Sanford, Clark 

 University, Worcester, Mass. 



5. An Electrical Drop Shutter apparatus for showing 



visual test cards for different lengths of time. 



6. Regulating Pendulum to mark off intervals of time. 



7. A Set of Weights for showing the influence of size on the 



estimation of weight. 



8. An Instrument for measuring the amount of Brentano's illu- 



sion in judging length of lines. 



Nos. 5, 6, 7 and 8 are exhibited by Chas. B. Bliss, 

 New York University. 



9. Instruments for studying the force, extent and time of 



movements and the effects of sensations on movements. 

 Exhibited by J. McK. Cattell, Columbia University. 



a. Oval hand dynamometer (Collin). 



b. Hand dynamometer (Galton) . 



c. Dynamometer giving archer's pull (Galton). 



d. Spring dynamometer for arm (Cattell) . 



e. Dynamometer for forefinger, used in the study of fatigue 

 and the effect of sensation on movements for kymograph 

 (Cattell). 



