12a 



In general growth will not oocur in the absence of 

 oxygen hut slight anaerobic growth has been observed 

 in seedlings of Helianthus annus ; Wieler,- Unters. 

 bot. Inst. Tubingen 1: 200, 223 (1883J; Ilabokikh,- 

 Bot. Centbl., Beih. 13: 272 (1902). Nabokikh ( loc . cit . ) 

 and Czapek,- Jahrb. wiss. Bot. 27 ; 277 (1895), have ob- 

 served the continuance of the geotropic response in the 

 absence of oxygen. The continuance of the division of 

 the nucleus in the absence of oxygen is reported by 

 Demoor,- Arch. Biol. 13: 76 (1894). Gemination of 

 rice seeds in the absence of oxygen has been reported 

 by Takahashi (Bull. Coll. Agr., Tokyo Imp. Univ. 6: 

 439-442 (1905) ) and confirmed by Demoussy (C. R. 145 : 

 1194-1196 (1907) J, Akemine (Landw. Ztg. 63: 78-93 (1914) ) 

 and Free (unpublished experiments). 



