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THE AMERICAN NATURALIST [Vol. LI 



tioii by tlie niaii pricking' out, the young plants from the seed boxes, 

 of the larger, that is, the standard plants. This point had been antici- 

 pated and the workmen cautioned to take the plants just as they came, 

 but it is against all of a gardener's training to throw aside a good 



However, in the F3 plants given above, from F2 segre- 

 gating plants, all the seeds which were planted and lived 

 were grown to maturity, so that the latter source of error, 

 of unequal sampling, was avoided. Still there was the 

 same deficiency of dwarfs. 



Craig (1907), in the same publication, reports large 

 numbers of the same cross which also showed a deviation 

 in the second generation, of too many standard plants. 

 He does not state whether or not an attempt was made 

 to grow all the plants obtained from the seed planted. 

 His figures are as follows : 



stone X Dwarf Aristocrat, F3: Standards .... 154 155 

 Dwarfs 52 51 



Both Halsted (1905) and Price and Drinkard (1908) 

 give figures on the proportions of standard and dwarf 

 plants obtained in F2 populations. I have tabulated their 

 data as follows : 



Ealsted's Data {pp. 450-462) 



Dwarf Champion X Magnus, 65 20 



Dwarf Stone X Extra Early Tree, 14 6 



Lemon Blush X Dwarf Champion, F, 18 3 



Total found 122 34 



Expected 117 39 



Price and Drinkard's Data (TahJe XI, p. 40) 



Potato Leaf X Dwarf Champic 



