Page 



Subchapter 2. Summary and practical applications 980 



1. Aeronauts 981 



2. Mountain travellers 991 



3. Dwellers in high places 998 



4. Animal and plant life at high elevations 1005 



5. Medical applications 1006 



Chapter II. Increased pressure 1009 



Subchapter 1. Observations, theories, and recent discussions 1009 



1. High pressures 1009 



Guichard. Heiberg. 



2. Low pressures. Medical apparatuses 1014 



J. Pravaz. G. Liebig. Leonid Simonoff. 



Subchapter 2. Summary and practical applications 1021 



1. High pressures 1021 



2. Low pressures^ _i 1024 



3. Sudden decompression 1027 



4. Practical applications. Therapeutics and hygiene 1027 



5. Conclusion from the point of view of general natural history 1032 



Chapter III. General conclusions 1036 



Addenda I. Relations between heights and barometric pressures 1039 



II. The new work of Dr. Mermod 1041 



Index — 1045 



XXVIII 



