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THE AMERICAN NATURALIST [Vol. XLVI 



of fact, both conditions appeared with apparently no 

 intermediates. It would, however, be unsafe to regard 

 this behavior as an exception to Mendelian laws since 

 there is the possibility that the strain biennis D is hetero- 

 zygous with respect to the red coloration of its papillate 

 glands. To be sure, a culture of 51 plants from self -polli- 

 nated seed of the wild plant {biennis D) were uniform 

 even to the red coloration of the glands on the green 

 stems and ovaries, but, nevertheless, there are similar 

 wild biennis types that lack this coloration, and there has 



