No. .529] 



NOTES AND LITERATURE 



61 



each case gave identical results with those of 409; that is, F, 

 consisted of two types, one heterozygote, and the other homozy- 

 gote of the maternal type. Using the same individuals which 

 produced a set of eggs of this kind to secure another set of eggs 

 produced under the conditions of experiment 410, the results 

 in each of the seven experiments gave F. which behaved in all 

 respects as a homozygote of the maternal type. This fact is set 

 forth in considerable detail and Plate III illustrates it just as 

 here described. This result occurred in all cases whether the 

 set of eggs produced under the conditions of experiment 410 



men) is this. While in experiment 410 the results in each of the 

 eleven cases gave ordinary Mendelian heterozygotes in F 1} in 

 each of the seven cases of 409/411 the eggs produced under the 

 same conditions as 410 ^ave homozygotes of the maternal type. 

 Thus, the conditions of experiment 410 in eleven cases gave one 

 result, in seven other eases they gave an entirely different re- 

 sult, and the only difference in the conditions was that in 

 409/411 the female either had produced or was in the future 

 to produce a set of eggs under the conditions of experiment 409 

 (p. 295). 



Thus, on page 294, in describing experiment 410, it is stated 

 that experiment 410 gave F, all heterozygote; on page 330 it is 

 stated that experiment 410 gave F, all homozygote of the ma- 

 ternal type; on page 29f>-(>. in describing experiment 409/411. 

 it is stated that, under the conditions of experiment 410, this 

 experiment gnve F, all homo/yuotes of the maternal type; and 

 on page 304 it is stated that experiment 409 411, when per- 

 formed under the conditions of 410. gave results identical with 

 those of 410. These statements are directly contradictory. 

 We must withhold judgment on this point of influencing the 

 hereditary factors at the time of fertilizations, until Mr. Tower 



In these exceptional cases, where ihc F, hybrid behaved as a 



tell us whether the F, and later fenerations were each time pro- 

 duced under the conditions which produced the aberrant I'/. 

 One would infer, however, that they were not, and that the 



