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THE AMERICAN NATURALIST [Vol. XLV 



was done by planting the no. 54 between rows of the 

 hybrid. Sufficient crossed seeds which had become 

 starchy through Xenia were obtained to make the weights 

 given. Not all of the ears, however, had 25 starchy seeds, 

 which accounts for the small number of plants meas- 

 ured. Furthermore, the seeds of no. 54 were a rather 

 mixed lot, which of course resulted in a higher varia- 

 bility than would probably have been found if only seeds 



of the individual plant of no. 54 which was used as the 

 male parent of the cross, could have been planted. Per- 

 haps it should be noted here since the question might 

 arise, that since the size of the seeds on an ear is gov- 

 erned by the development of the pericarp, the sugar corn, 

 no. 54, was unaffected in other ways than by having the 

 pericarp filled out with starch by the hybridization which 

 occurred attended by the resultant Xenia. 



In Tables III and IV the measurements and weights of 

 the generation were recorded from only one cross, 

 although three crosses between the two varieties were 

 made. It might be said that one has the right to com- 



