OBSERVATIONS ON TABLE V. 183 
the form will in time be overwhelmed, unless other causes come in to 
counteract; but here we see that, if segregate fecundity occurs in the 
ratio of 10 to 9, the pure form becomes 12 times as numerous as the 
’ half-breeds; and if in the ratio of 10 to 5, it becomes 100 times as 
numerous. 
Second. Again, if we take the proportional differences between the 
different terms of the top line opposite c = oF we shall find them very 
unlike the differences that appear in the bottom line opposite c = ee 
In the former the first term is 9 times as large as the last, while in the 
latter the first term is more than 80 times as large as the last. This 
shows that when positive segregation is intense, differences in the 
degree of segregate fecundity produce greater contrasts than the 
same differences do when the positive segregation is slight. 
Third. A similar distinction is found when we compare the right- 
hand column with the left-hand column. The smallest term in the 
former is to the largest term in the same column as 1 to 899, while in 
the left-hand column the greatest is as 1 to 100. This shows that 
when segregate fecundity is strongly developed, differences in the 
degrees of positive segregation produce greater contrasts than the 
same differences produce when the segregate fecundity is but slightly 
developed. : 
