10 



nature of their surroundings. 1 If long continued 

 existence and successful reproduction form the cri- 

 teria, this anaerobic existence appears to be confined to 

 lower organisms. However, it is now welljknown that 

 temporarily anaerobic existence is possible to many of 



1. On facultative anaerobic bacteria see 

 the authors cited in the last note also: Kitt,- Centbl. 

 Bakt. 17: 168 (1895); Xedrowski,- Zeits. Hyg. 20: 

 (1895); Chmdiakow,- Centbl. Bakt. 4: 392 

 (1895); Hitter,- PI or a 85: 135 (1898), 86: 329 (1899). 

 On Mucor see: Pasteur,- Etudes sur la biere, pp. 130- 

 132 J187G); Kostytschew,- Centbl. Bakt., Abt. II, 13: 

 490 (1904); ./ehmer,- Centbl. Bakt., Abt* II, 14: 556 

 (1905), 15: 8 (1905). On the alcohol yeast see Pas- 

 teur,- Stfcdes sur la biere (1876); Beijerinck,- Arch. 

 neelandaises 29_: 1 (1894); Iwanowski,- Sap. Akad. 



k, St. Petersburg 73: heft 2 (1894); Korff,- Centbl. 

 Bakt., Abt. 2, 4: 465-472 (1898), 12: 501-507 (1899), 

 13: 529-555 (1899), 14: 561-5C9 (1899), 15-16 : 61 - 

 627 (1899); Brown,- Ann. Bot . 8: 19 7-226 (1914). 



