ILLUSTRATIONS 



PAGE. 



Frontispiece. Diet and control squads and investigators, International Young 

 Men's Christian Association College, Springfield, Massachusetts, January 

 11, 1918 



Fig. 1. Drying oven 73 



2. Connections with subject, portable respu-ation apparatus 83 



3. Spirometer and absorbing system of portable respiration apparatus 84 



4. Portable respiration apparatus ready for bedside use with four subjects at the 



International Young Men's Christian Association College, Springfield, 

 Massachusetts 92 



5. Interior of group respiration chamber showing arrangement of beds in three 



sections of four each 92 



6. View of east end of group respiration chamber 96 



7. Cross-section of group respiration chamber from west to east 97 



8. Side view of collection chambers and absorption apparatus of the group respi- 



ration chamber 103 



9. Detail of wind chest 104 



10. Detail of opening between wind chest and can Ci or C2 105 



11. Top view of lower shelf of absorption apparatus of group respiration chamber 107 



12. View from above of top of absorption table of group respiration chamber . . . 108 



13. Details of device for regulating pressure inside of cylindrical cans above wind 



chest 109 



14. The treadmill chamber 122 



15. Electrical counter 127 



16. Photographic record of the pulse, respiration, and steps of Bro while he was 



walking in the treadmill chamber 128 



17. Respiration recorder 131 



18. Specimen record for accuracy in tracing between irregular parallel lines 141 



19. A block of 100 digits arranged in 10 columns of 10 each, as in the material for 



addition work 143 



20. One block of the addition material showing the sums properly entered for the 



vertical and horizontal columns 143 



21. A portion of a pitch discrimination record 147 



22. One corner of Room C, the main psychological laboratory 152 



23. The subject in position during the moments of physical exertion 152 



24. Sample pulse records showing changes in the pulse-rate occasioned by short 



periods of exertion 152 



25. Detail of the key closed by the subject's weight during physical exertion .... 153 



26. The body electrodes used in recording electrocardiograms during physical 



activity 154 



27. Detail of a device mounted on a Bhx-Sandstrom kymograph whereby the 



interval between the opening of two circuits may be progressively changed 156 



28. Schematic wiring diagram for the apparatus used in room B in the evening 



measurements : patellar reflex and word reactions 157 



29. A portion of a sample record for the evening measurements in room B 158 



30. Details of the falhng plate camera and accessories used in recording eye 



reactions 160 



31. The apparatus used in room B for patellar reflex, word reactions, and finger 



movements 160 



32. Diagram of the adjustable head rest 162 



33. Detail of the small shutters and windows in the eye-reaction stimulus 



apparatus 163 



34. Wiring diagram for the eye-reaction stimulus apparatus 164 



35. A subject in position at the photographic apparatus and ready for the eye 



reactions 164 



(IX) 



