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THE A2lEIiICAN NATURALIST [Vol. LI 



with a microscopical examination of the pollen of 10-15 buds 

 from different parts of the plant will enable one to estimate its 

 probable somatic chromosome number; this estimate becomes 

 more trustworthy when one considers also (using Lamarckiana 

 as the standard for comparison) the number of seeds produced 

 per fruit by selfed flowers, the percentage of seeds which germi- 

 nate, and the hereditary behavior of the plant. 



