The effect of altitude 



253 



individual constancy of the dissociation curve, which seems to be true 

 as a first approximation. 



FIG. 121. Dissociation curves of Mathison, Camis and Eoberts, with points determined 

 at high altitudes, the blood being exposed to the existing alveolar C0 2 pressure of 

 the place. 



The figures to which we have just referred the reader will 

 convince him, at all events they have convinced us, that the principle 

 is true, within the limits of the method of which we have been 

 treating. But may it not be that these limits are too wide for us to 

 be able to discern the changes due to the decreased carbonic acid 

 pressure? Have we a right to expect that we can observe the 



