RESPIRATION 



377 



letting go the anchor and landing safely, but succeeded. Figure 

 100 indicates diagrammatically the course of the balloon. The 

 maximum height was given by an automatic recorder. 



9000 



3000 



2000 



MMW/////,'. y////////////^^^^ 



L0ire ri.-.! ' C<ron 



Chotfouroux INOHC 



Figure 100. 

 Diagram of the voyage of the Zenith, April 15, 1875. 



It was clear that all three had been paralyzed before they tried 

 to breathe the oxygen. Doubtless they were all convinced that 

 they felt all right and in full possession of all their faculties. The 

 feeling of self-confidence seems always to be present in conditions 

 of gradually advancing anoxaemia. I have experienced it myself, 

 not only in steel chambers, but also in experimental CO poisoning; 

 and the conviction that one is fully competent is still present in 

 spite of the knowledge that this conviction may be a gross illusion. 

 A man who is grossly intoxicated by alcohol has just the same 



