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THE AMERICAN NATURALIST [Vol. XLYIII 



single fruit from carefully sealed female buds, others have given 

 plenty of empty fruit, but some hybrids have produced several 

 fruits, full of viable seed. If this seed is formed by the par- 

 thenogenetic development of unfertilized normal egg-cells, as 

 we have reason to believe, we expect to raise a variable F 2 gene- 

 ration of exclusively homozygous plants. If these seeds have 

 developed by apogamy, or any other asexual process, we expect 

 to obtain a second generation consisting exclusively of plants 

 like the original hybrids. Thus we will have a non-cytological 

 test to decide between apogamy and true parthenogenesis. 



A. C. Hagedoorn, 

 A. L. Hagedoorn 



