98 SCIENCE PROGRESS. 



One other point remains, and that is, how far, judging 

 from the observations and tracings which are reproduced 

 above, Conway had reached the highest climbable altitude. 

 During rest at least, even at 23,000 feet, the curves indicate 

 on the whole, that muscular fatigue and distress of the 

 heart were present rather than the nearly complete collapse 

 of muscular power which accompanies well-marked heart- 

 failure with the vagus slowing and irregularity. There is, 

 therefore, no obvious reason why they should not have 

 gone higher, if they could do it quietly enough and if they 

 could choose their own times for going on and camping, 

 etc., which of course is the real difficulty. The curves show 

 that they were in a condition to go on, and they agree with 

 Conway's own feeling that they had not come to the end of 

 their tether. 



BIBLIOGRAPHY. 



(1) H., A., and R. de Schlagintweit. India and High Asia, 



vol. ii., p. 484. London, 1862. 



(2) E. WHYMPER. Great Andes of the Equator. London, 1892. 



(3) For literature up to 1887, vide La Pression Barometrique, 



Paul Bert. Paris, 1877. 



(4) ROY and ADAMI. Contributions to the Physiology and 



Pathology of the Mammalian Heart. Philosophical Trans- 

 actions, vol. clxxxiii., p. 284, 1892. 



(5) T. Clifford ALLBUTT. St. Georges Hospital Report, vol. v., 



1870. 

 ROY and ADAMI. On Heart Overstrain. British Medical 

 Journal, 15th December, 1888. 



(6) Roy and Sherrington. On the Regulation of the Blood 



Supply of the Brain. Journal of Physiology, vol. xi., p. 85. 



Charles S. Roy. 



