vy 



is shown by the ability of the alcohol yeast and other 

 mioro-organisms to live in the presence of large amounts 

 of carbon dioxide, 1 rising, in the case of certain 

 bacteria to a pressure of 50 atmospheres of the gas. 



More significant for the present inquiry are 

 the disturbances of various specific vital functions which 

 follow exposure to excessive partial pressures of carbon 

 dioxide, Thus excess of carbon dioxide is reported to 

 decrease the subsequent power of photosynthesis and to 

 interfere with the power of producing chlorophyll. 



1. Melsens,- G. 3. 70: 632 (1870); Fraenxel,- 

 Zeits. fur Hyg. 5: 332 (1889); d'Arsonval,- G. R. 112 : 

 667 (1891); Sabrazes and Bazin,- Koch's Jahrb, : 



34 (1894); Flugge,- Micro org, , 3rd ed., vol. 1, p. 445 

 (189G); Jensen,- Gentbl. Bakt. 6: 762 (1900); Poa,- 

 Atti Lincei,- (5), II, 15: 53-58 ( 1906 J ; Hoffman, - 

 Arch. Hyg. 57 : 379-400 (1906). As in the case of higher 

 plants, there is much conflict of evidence concerning the 

 minimum partial pressure of carbon dioxide which is in- 

 jurious, especially to yeast. Doubtxess different species 

 or strains differ in their susceptibility, 



2. Sabrazes and Bazin,- Koch 1 a Jahrb. £ 



34 (18*4). 



3. Boussingault,- Agronomie,- vol. 4, p. 287 

 (1868); Pringsheim,- Sitzungsber. Akad. V/iss., Berlin 

 1887 : 768; Sngelmann,- Bot. Ztg. : 717 (1888). 



4. Bohm,- Sitzungsber. Akad. ffiss,, ".7ien ; 



14 (1873). 



