IV CONTENTS. 



Methods and apparatus used in the research — continued. page. 



Technique for determining gaseous metabohsm during rest — continued. 

 Portable respiration apparatus — continued. 



Modified method for determining the oxygen consumption 89 



Method of calculating oxygen consumption 90 



Practical use of the apparatus 92 



Group respiration apparatus • 92 



General principle of group respiration apparatus 95 



Respiration chamber 96 



Ventilation of respiration chamber 99 



Incoming air 99 



Outgoing air 100 



Aliquoting and analysis of ventilating air-current 101 



General principle of method for aliquoting and analysis 101 



Collection chambers and absorption apparatus 103 



DupUcation of samples 106 



Collection of air sample 108 



Removal of air from sampling cans Ill 



Quantitative absorption of carbon dioxide 113 



Test of ahquoting device 115 



Residual analysis 117 



Arrangements for sleeping 119 



Technique for determining effect of muscular work 119 



Measurement of work of bicycle riding. 119 



Measurement of gaseous metabohsm during work 120 



The treadmill chamber 121 



Air-drier and psychrometer 123 



Ventilation of chamber 123 



Tension equalizers 124 



Resistance thermometers 124 



Barometer 124 



Gas-analysis apparatus 124 



Volume of chamber 125 



Measurement of work performed during walking 126 



The step recorder 129 



Pulse-rate 129 



Respiration-rate 130 



Blood pressure following walking 131 



Routine of walking experiment 132 



Method of calculating results of the metabohsm experiments during walking.. . 134 



Psychological program and technique 137 



Psychological measvirements used 139 



Measurements by the group method 139 



Accuracy in tracing between irregular parallel Unes 140 



Memory span for 4-letter EngUsh words 142 



Addition of one-place numbers 143 



Discrimination for specified number groups on a printed page 145 



Discrimination for the pitch of tones 145 



Measurements by the individual method 147 



Strength of grip 150 



Changes in pulse-rate occasioned by short periods of exertion 151 



Patellar-reflex latency, amphtude, and refractory period 155 



Reaction time for turning the eye to a new point of regard 159 



Reaction time for speaking 4-letter words 165 



Continuous discrimination and reaction in finding serial numbers 167 



Sensory threshold for visual efficiency 169 



Sensory threshold for electric shock 176 



Speed of the eye movements 184 



Speed of the finger movements 186 



Efficiency in traversing a right-angle maze 188 



Efficiency in performing certain clerical tasks 190 



