were also loaned us for shorter periods by the Library of Congress 

 and by the Aero-Medical Laboratory at Wright Field. Photographic 

 copies of the illustrations in the original edition from which the 

 plates for the present volume were prepared were furnished us by 

 the staff of the Wright Field Aero-Medical Laboratory. We are 

 grateful to Colonel Otis O. Benson, Jr., who arranged to have this 

 done. 



Various agencies of the Ohio State University were of consider- 

 able assistance in a number of ways. Funds to help defray the cost 

 of clerical assistance were furnished by President Bevis, and by 

 the Graduate School upon the recommendation of Dean Alpheus 

 Smith. The staff of the library furnished assistance whenever 

 called upon, and Mr. Oscar Thomas and Mr. John B. Fullen of the 

 Alumni Office were of great assistance in a variety of ways; we are 

 especially grateful to them both. 



Finally, we want to thank Professor John F. Fulton of Yale 

 University not only for the preparation of the foreword, but also for 

 his enthusiastic support and valuable advice throughout the entire 

 project, and Mr. F. C. Long of the College Book Company, without 

 whose vision and faith in Paul Bert the publication of the complete 

 translation would have been impossible. 



It is with some hesitation that we turn the manuscript over to 

 the printer. It contains errors and imperfections. Many of these 

 could be corrected by further revision, but such revision takes time 

 and in the present state of the world it seems desirable to make 

 Paul Bert's classic work available to the many English speaking 

 investigators in the field of aviation medicine with as little delay 

 as possible. We have therefore foregone further revision and polish- 

 ing. We know nothing would please Paul Bert more than the 

 knowledge that his work had been of use to the Allied Nations in 

 their struggle to free his beloved country from the shackles of its 

 traditional enemy. Paul Bert was a liberal, a humanitarian, and 

 a loyal patriot, as well as an outstanding scientist. During the 

 months that we have worked on the translation of his great book 

 our admiration and respect for him have grown. It is our sincere 

 hope that we have made none of his affirmations negations and 

 that we have been translators without being traitors. 



M. A. H. 

 F. A. H. 



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