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THE AMERICAN NATURALIST [Vol. LI 



The data also show that there is no linkage between the 

 other two combinations of factors reported, viz., vine 

 habit and fruit color, and fruit color and fruit shape. Cor- 

 recting the number of dwarfs in the same way as in Table 

 III the results for these two combinations of factors are 

 given in Tables IV and V. 



TABLE V 



C0RRECTED2 Distribution of the F, Plants with Kespect to their Shape 

 OF Fruit and Color of Fruit— Characters which 



From these two tabulations it will be seen that the 

 agreement between expectation and observation, when the 

 number of dwarfs is increased to the number expected, is 

 reasonably close, and the deviation from the expected is 

 not such as to suggest linkage between any of these 

 factors. 



Both Halsted, and Price and Drinkard, in the publica- 

 tions previously mentioned, give a large number of 

 crosses of tomatoes where the inheritance of many dif- 

 ferent characters are studied. Unfortunately, in most 

 cases the data are presented in such a way as to show the 

 inheritance of only one character pair at a time. 



Halsted gives a dihybrid cross between two varieties 

 differing in habit of vine— standard (A) and dwarf (a), 

 and margin of leaf— serrate (B) and entire (b). The 



2 Since ha])it of vine is not concPrnerl in this cross it is, of course, un- 

 tables. I have done so simply to show that it does not affect the goodness of 



