52 



IPOMCEA PURPUREA. 



ClIAl\ J I. 



competition with each other; and in the right-hand 

 column we have the ratios of the one to the other, the 

 height of the intercrossed plants being taken at 100. 

 In the bottom line the mean height of the seventy- 

 three intercrossed plants is shown to be 85 84 inches, 

 and that of the seventy-three self-fertilised plants 

 (36-02 inches, or as 100 to 77. 



Table XVII. 

 Jpomcea purpurea. Summary of Measurements {in Inches) of 

 the Ten Generations. 



