Amphicarpaa monoica. 



rin a Is above ground. 



Feb. 8th. 



3 Atrial (i inch , 

 6 Terrestrial (i inch), 

 io Terrestrial (2 inches). 



Plants above ground. 



Feb. nth. 



3 Aerial (1 inch). 

 IO Terrestrial (l inch). 

 10 Terrestrial (2 inches). 



Results, 100 per cent, terrestrial, 12 per cent, aerial. 



Keeping aerial seeds in water at a temperature of 35 to 

 40 C. did not materially increase the rate. Considering 

 the results obtained from filing Canna and other seeds with 

 hard coverings, I concluded to try the method here. The 

 percentage then increased to 50, sometimes 70. 



About February 18th, seedlings from terrestrial seeds be- 

 gan to appear above ground ten to twelve days after 

 planting, and this time-interval between the planting and 

 germination decreased as spring advanced. 



In the autumn of '95, a pot containing one hundred seeds 

 was buried out-of-doors a foot below the surface, where it 

 remained during the winter. April 1st the weather became 

 quite warm. April 10th the pot was dug up ; every seed had 

 germinated, and within three or four days all plants came 

 above ground. From the middle to the end of April is the 

 time for the appearance of Amphicarpcea seedlings in their 



native haunts. 



It would seem, however, that terrestrial seeds require a 

 certain period of rest even if the requisite heat and moist- 

 ure are provided. For instance, seeds taken upon April 

 19th, from plants grown in the greenhouse during the win- 

 ter, were planted immediately, but failed to germinate until 

 early in June. While collecting seeds, on October 13, 

 from plants grown in the greenhouse during the summer, it 

 was impossible to gather all ; many remained among the 

 cinders. Notwithstanding the favorable conditions to 

 which these seeds were exposed, no indications of plants 

 were seen until the latter part of December. 



Similar results to those obtained in the autumn of '95 

 were got in '96. Again, after the latter part of December, 

 germination proceeded rapidly. 



