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THE AMERICAN NATURALIST [Vol. LI 



From these data it seems justifiable to conclude that 

 dwarfness and standardness form a simple allelomorphic 

 pair, free from any genetically complicating factors. 



I have gone to this length to demonstrate the normal 

 behavior of this character in order to be able to correct 

 Hedrick and Booth's data according to the proportion 

 of dwarf and standard plants, which presumably they 

 should have obtained if all the plants had been grown to 

 maturity, and if there had been equal viability. More- 

 over, whether or not the deficiency of dwarfs which they 

 obtained is due to unequal sampling, differential viability 

 or some unknown cause, there is no reason to suppose 

 that the cause, whatever it is, has anything to do with the 

 linkage between the factors for habit of vine and shape of 

 fruit. I have, therefore, in Table III increased the num- 



TABLE III 



CORRFCPFD DlSTKlBLTION OF THE T. Pl\NTS W'ITH RFSPFrT TO THEIR 



ber of dwarfs to the number theoretically expected, keep- 

 ing the proportion of the two different kinds of dwarfs 

 the same with respect to shape of fruit. From Table II 

 it can be noted that 379 standards were obtained. The- 

 oretically the dwarfs should have been one third of this 

 number, or 126.3. There were actually only 73. This 

 number would have to be increased 1.73 times in order to 

 bring the number of dwarfs up to the expected number. 

 Combining both the standard and dwarf plants in two 

 classes each, those with and those without constricted 

 fruit, and multiplying these two classes of dwarf plants 



