NOSTRIL-FORM. 61 



Tablb 48. — ^Distribution of frequency of grades of "openness"' in offspring when both parents are heterozygotis (DBxDR) . 



Table 49. — DistribtUion of frequency of grades of "openness" in offspring when both parents are heterozygous 



{DRxDR, F2 and later generations). 



Serial 

 No. 



Pen 

 No. 



34 

 35 

 36 

 37 

 38 

 39 

 40 

 41 

 42 

 43 

 44 

 45 

 46 

 47 

 48 

 49 

 60 

 61 

 62 

 63 

 54 

 65 

 66 

 67 

 68 

 59 

 61 



763 

 765 

 765 

 802 

 802 

 802 

 802 

 812 

 812 

 812 

 812 

 812 

 763 

 812 

 812 

 765 

 802 

 825 

 728 

 763 

 825 

 825 

 825 

 826 

 825 

 728 

 763 



Mother. 



No. Gen. 



3799 

 84 



984 

 4013 

 3954 

 4038 

 4164 

 84 



913 

 4728 

 5120 

 5640 

 2250 

 4726 

 4735 

 1790 

 4012 

 2198 

 2271 

 2700 



350 

 4708 

 5019 

 5035 

 6672 

 2248 



377 



Races. 



Hou.XWh.L 



...Do 



...Do 



Polish XMin.. 



...Do 



...Do 



...Do 



Hou.XWh.L. 



...Do 



...Do 



...Do 



Polish XMin.. 

 Hou.XWh.L. 



...Do 



...Do 



...Do 



Polish XMin.. 



...Do 



Hou.XWh.L. 



..Do 



Polish XMin.. 



.Do 



.Do 



.Do 



.Do 



Hou.XWh.L. 



...Do 



Gr. 



Totals (663) . 

 Percentages.. 



Father. 



Races. 



Hou.XWh.L. 



....Do 



Do 



Polish XMin.. 



....Do 



....Do 



....Do 



Hou.XWh.L. 



....Do 



....Do 



...Do 



....Do 



....Do 



Polish XMin.. 



....Do 



Hou.XWh.L. 

 Polish XMin.. 



....Do 



Hou.XWh.L, 



....Do 



Polish XMin., 



....Do 



....Do 



....Do 



Do 



Hou.XWh.L, 

 ....Do 



Gr. 



Total 

 gr. 



Grade of openness in offspring. 



115 641 

 17.424.7 



127 

 19.2 



53 

 8.0 



J. 3 



39 

 5.9 



10 

 1.5 



39 

 6.9 



57 

 8.6 



30.7 



10 



41 

 6.2 



These earlier data were not even roughly quantitative, and it is the 

 quantitative data that first give the key to the true relations. However, 

 sufficient evidence for the change in the conclusion is certainly due. The 



