570 



THE AMERICAN NATURALIST 



[Vol. LI 



the chemicals used are those frequently employed in fixing fluids ; 

 others were selected for various reasons. 



As shown in the List of Experiments the seeds and seedlings 

 were soaked for varying lengths of time in the solutions. The 

 material was either thoroughly washed before being placed on 

 moist filter paper in petri dishes to complete germination or 

 it was placed on paper which had been moistened with the same 

 solution as that in which the material had been soaked. Since 

 the seeds of CEnothera biermis are about 96 per cent, viable, 

 seed sterility was not an important factor in the results of the 

 experiments. Dr. Davis's large cultures under normal conditions 

 were used as controls. About one hundred seeds were used in 

 each experiment. 



List of Experiments 



