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 Fig. 77. Death by carbonic acid; relation of the respiration and the 

 circulation to the carbonic acid content of the blood 



(Experiment DCXV) 919 



Fig. 78. Death by carbonic acid; last respiratory movements (Experi- 

 ment DCXV) 920 



Fig. 79. Death by asphyxia in a closed vessel; gases of the air (Exper- 

 iment DCXL) 932 



Fig. 80. Same; gases of the blood (Experiment DCXXXIV) 932 



Fig. 81. Relation between the oxygen content of the air and that of 



the blood 933 



Fig. 82. Pulse at the Riffel Pass (2780 meters), during an attack of 



mountain sickness 955 



Pulse at the Sattel-Tolle (4300 meters) 955 



Pulse at the Riffel (2569 meters), rest on the return trip 956 



Pulse at Morges (380 meters), absolute repose 956 



The basket of the Zenith at a high altitude 966 



Diagram of the high altitude ascension on April 15, 1875 970 



Portrait of Sivel 972 



Portrait of Croce-Spinelli 973 



XXXII 



