46 



IPOMCEA PURPUREA. 



Chap. II. 



Colchester-crossed plants was much taller than any one of 

 the intercrossed plants on the opposite side of the same pot ; 

 and in the three other pots somewhat taller. I should state 

 that two of the Colchester-crossed plants in Pot IV., when 

 about two-thirds grown, became much diseased, and were, 

 together with their intercrossed opponents, rejected. The 

 remaining nineteen plants, when almost fully grown, were 

 measured, with the following result : 



Table XIII. 



In sixteen out of these nineteen pairs, the Colchester-crossed 

 plant exceeded in height its intercrossed opponent. The average 

 height of the Colchester-crossed is 84*03 inches, and that of 

 the intercrossed 65 " 78 inches ; or as 100 to 78. With respect 



