PLAN OF THE INVESTIGATION. 15 



SERIES III. 



(1) Adequate speech-reaction to visual words. (2) Memory, repetitions 

 and new material. (3) Protective lid-reflex to noise stimulus with con- 

 trolled attention. (4) Involuntary eye-movements in reading a moving text 

 with supposed constant fixation (not continued). (5) Pulse-records, quiet, 

 immediately after standing and after 60 seconds of standing, after two double 

 genuflections, and after 60 seconds quiet. (6) Threshold for muscle contrac- 

 tion in response to Faradic stimulation (not continued). 



SERIES IV. 



(1) Adequate speech-reactions to complete series of 24 words with con- 

 current pulse-records. (2) Finger, hand, and arm tremors, photographic 

 registration (not continued). (3) Rapid reading, with photographic registra- 

 tion of eye-movements: (a) natural, as rapid as possible; (6) letter by letter 

 (not continued). (4) Convergence and divergence eye-movements (not con- 

 tinued). (5) Pulse-records as in Series III. 



SERIES V. 



(1) Association experiments under the direction of Dr. F. L. Wells, of 

 McLean Hospital staff, with continuous graphic records of reaction time, 

 pulse, and respiration, and occasional observation of the " psycho-galvanic 

 reflex" by the aid of the string galvanometer. (2) Sensory threshold to Fara- 

 dic stimulation. 



In the 12-hour experiments, Series I to IV were condensed to a 

 single series, which was repeated each hour: (1) patellar reflex; (2) 

 sensory threshold to Faradic stimulation; (3) protective lid-reflex; 



(4) eye-reaction; (5) eye-movement; (6) speech-reaction with pulse; 

 (7) finger-movement with pulse. 



Series V was never changed nor united with any other. It was not 

 given to the psychopathic subjects. (See p. 25.) 



For most of the main group of subjects, and for all the psychopathic 

 and occasional subjects, Series I to IV were condensed to two series, as 

 follows : 



SERIES I A. 



(1) Patellar reflex; (2) speech-reactions with pulse; (3) finger-movements 

 with pulse; (4) threshold to Faradic stimulation. 



SERIES II A. 



(1) Eye-reaction; (2) eye-movement; (3) protective lid-reflex; (4) memory; 



(5) pulse at rest, after rising, and after two double genuflections. 



In the succeeding detailed discussion of the various techniques and 

 their results the matter will be arranged according to the nature of the 

 experiment rather than according to the series. 



If we call the first principle which determined our selection of meas- 

 urable phenomena the principle of systematic coordination, a second 

 conscious departure from traditional procedure may be called the 

 principle of relative simplicity. We have made the attempt to inves- 



