1914] ATWOOD—GERMINATION OF AVENA 397 
inverted battery jar set in a water seal so as to leave the seeds 2.25 
liters of gas, which was introduced by displacement. All was 
ee me 
~ 
et 
' eg 
Io 3 “ 
60 
A 
20 
eset 4 12 20 
- 3.—Percentage of germination of wild oats in reduced oxygen concentrations; 
intact csi solid line; seared seeds, broken line. 
Cle 
OxygZ 12 16 20 
Fic. 4. ae £ i t f tame and wild oats in reduced 
oxygen concentrations; intact seed, solid 1 tes seared seed, broken line; Avena 
Sativa, curves a and b; Avena fatua, c and d. 
