6 ILLUSTRATIONS. 



PAGE. 



FIG. 45. Types of respiration of subject M. J. S. at end of second and fourth periods 



with the spirometer unit on July 19, 1912 165 



46. Probability curves for the series of comparison experiments with the spiro- 



meter unit and the Douglas method 172 



47. Probability curves for the series of comparison experiments with nose- and 



mouth-breathing (tension-equalizer unit) 179 



48. Probability curves for the series of comparison experiments with nose- and 



mouth-breathing (spirometer unit) 1 83 



49. Probability curves for the series of comparison experiments with nose- and 



mouth-breathing (Tissot apparatus) 188 



50. Types of respiration of subject L. E. E. as recorded from the spirometer bell 



in the second period on November 18, 1912 190 



51. Probability curves for the series of comparison experiments with nosepieces 



and mask (spirometer unit) 193 



52. Types of respiration of subject W. J. T. as shown by the pneumograph in the 



first two periods with the Mueller valves and Tissot spirometer on 

 March 29, 1913 196 



53. Type of respiration of subject W. J. T. as recorded from the spirometer bell 



in the second period with the spirometer unit on March 29, 1913 .... 196 



54. Probability curves for the series of comparison experiments with the spi- 



rometer unit and the Mueller valves 199 



55. Type of respiration of subject J. H. H. in the fourth and fifth periods on 



April 18, 1913 201 



56. Probability curves for the series of comparison experiments with the Tissot 



valves and the Mueller valves 205 



57. Type of respiration of subject J. K. M. without additional dead space on 



September 20, 1912 207 



58. Type of respiration of subject J. K. M. with 45 c.c. additional dead space 



on September 20, 1912 207 



59. Type of respiration of subject W. F. O'H. in the third period with additional 



dead space on October 27, 1912 208 



60. Type of respiration of subject W. F. O'H. at the end of the third period with- 



out additional dead space on October 27, 1912 208 



61. Type of respiration of subject W. F. O'H. in the early part of the second 



period without additional dead space on October 27, 1912 208 



62. Type of respiration of subject W. F. O'H. at the beginning of the fourth 



period without additional dead space on October 27, 1912 208 



63. Type of respiration of subject J. W. P. in the second period with additional 



dead space on October 22, 1912 209 



64. Type of respiration of subject J. K. M. with 90 c.c. additional dead space 



on September 21, 1912 209 



65. Type of respiration of subject J. K. M. without additional dead space on 



September 21, 1912 210 



66. Type of respiration of subject T. M. C. without additional dead space on 



November 8, 1912 211 



67. Type of respiration of subject T. M. C. with 135 c.c. additional dead space 



on November 8, 1912 211 



68. Type of respiration of subject P. F. J. without additional dead space on 



November 7, 1912 211 



69. Type of respiration of subject P. F. J. with 135 c.c. additional dead space 



on November 7, 1912 212 



70. Type of respiration of subject J. B. T. with 224 c.c. additional dead space on 



December 7, 1912 212 



71. Type of respiration of subject J. B. T. without additional dead space on 



December 7, 1912 213 



72. Probability curves for the series of comparison experiments with and without 



additional dead space (spirometer unit) 219 



73. Types of respiration of subject W. J. T. in second and third periods on 



March 1, 1913 221 



74. Probability curves for the series of comparison experiments with and with- 



out the counterpoise on the Tissot spirometer 225 





