Compressed Air; Low Pressures 779 



longer there; the development of tadpoles or the larvae of insects 

 takes place more quickly there. 



It seems then to be demonstrated that, for healthy animals, the 

 ordinary atmospheric pressure provides the best condition of life, 

 and that an increase, if at all considerable, is more to be feared 

 than to be desired. 



c- £Pf 1 y. ct , ion - toxi( i" e de lacide phenique, by MM. Paul Bert and Tolyet. Memoires de la 

 Societe de biologie, 1870. p. 63-88. 



2 Comptes rendus de I'Academie des Sciences, vol. LXIV, p. 622, 1867. 

 These numbers and those of the following experiments are reduced to 0° and 76 c. pressure 

 Ihese temperatures, recorded by my thermometer in this experiment and in several others, 

 are certainly too low, speaking absolutely. But that is of little importance, since only the com- 

 parison is of interest. 



r r, 1 ? h y sical researches on the respiration of man. Journal de Vanatomic et de la phvsioloqic 

 of Robin; l<irst year. p. 524; 1864. ' 



'Lecons sur la physiologie de la respiration, p. 384. 



