222 THE CAUSE OP MOUNTAIN SICKNESS 



THE CAUSE OP THE SYMPTOMS OF MOUNTAIN SICKNESS, &c. 



Analysing the blood-gases, Bert found the amount of oxygen 

 in the blood diminished by \ when the barometric pressure was 

 lowered to J. He rightly attributed all the symptoms to want of 



p tension 

 in mm. Hg 



6399 



5088 



4&T7 



42-66 



35-55 



28-44 



21-33 



14-22 



mm. Hg 7.77 



20% 30 40 



Saturation of Hb 



50 



100% 



FIG. 8. Comparison of Dissociation Curves of OHb. Loewy (men) ; O Paul 

 Bert ; 4> Hiifner (new) ; <jj> Hiifner (old) ; -9- Loewy and Zuntz (dog) ; 4= Loewy 

 (62 sat. of venous blood of men) ; + Strassburg-Wolffberg (venous blood of dogs). 



oxygen. His analyses were supported by others of Fraenkel 

 and Geppert. The acceptance of this simple and satisfying ex- 

 planation was rendered difficult by the publication of Htifner's 

 dissociation curve of oxygen, a curve which Htifner worked out 

 from solutions of purified haemoglobin crystals. Hiifner found 

 the Hb solution was more than 92 per cent. sat. when the 2 

 tension equalled only 4 per cent, atm., and to explain the death 



