TO DOCTOR JOURDANET 



My dear Colleague: 



It is to you that I owe, not only the first idea of this 

 work, but also the material means to execute it, which 

 are so difficult to collect. I have been very happy to 

 see physiological experimentation on one of the most 

 important points of my study confirm entirely the 

 theory which your intelligence had deduced from nu- 

 merous pathological observations collected on the high 

 Mexican plateaux. For all these reasons I should dedi- 

 cate this book to you, and I do so with the greater 

 pleasure because you are one of those persons who 

 would make gratitude easy to even the most thankless 

 natures. 



Paul Bert. 



XIII 



