244 



Chester XVII 



Our dissociation curves had been mapped out in England before 

 we left, they have been re-determined on several subsequent occa- 

 sions in this country. We attached great importance to the accurate 

 determination of them at the time and still greater importance 

 now. At that time they were important merely as objects of com- 

 parison for our other curves. Now they are more important, for it is 

 known that if one curve is accurately ascertained, any other curves 

 for the same individual can be found by the accurate determination 

 of a single point. 



FIG. 115. The station in the Caiiadas (7000 feet). The peak in the background. (Douglas.) 



We gave in Chapter XIV the dissociation curve of Douglas, 

 showing the points on it which have been determined by us, together 

 with those which have been determined by Haldane and Douglas for 

 the same carbonic acid pressure, namely 40 mm. 



The second station in Teneriffe was at Las Canadas. From the 

 point of view of the meteorologist this station is of especial interest. 

 It is about 7000 feet above the sea-level and therefore not much 

 higher than many centres of population. Johannesburg, for instance, 

 is close upon 6000 feet putting aside therefore such places as the 

 mining towns in the Andes, the Canadas are a fair example of the 



