The fourteen crossed plants average in height 81.39 inches and the fourteen self-fertilised plants 64.07, or as 100 to 79.  One self-fertilised plant in Pot 3 exceeded, and one in Pot 4 equalled in height, its opponent.  The self-fertilised plants showed no sign of inheriting the precocious growth of their parents; this having been due, as it would appear, to the abnormal state of the seeds from the unhealthiness of their parents.  The fourteen self-fertilised plants yielded only forty spontaneously self-fertilised capsules, to which must be added seven, the product of ten flowers artificially self-fertilised.  On the other hand, the fourteen crossed plants yielded 152 spontaneously self-fertilised capsules; but thirty-six flowers on these plants were crossed (yielding thirty-three capsules), and these flowers would probably have produced about thirty spontaneously self-fertilised capsules.  Therefore an equal number of the crossed and self-fertilised plants would have produced capsules in the proportion of about 182 to 47, or as 100 to 26.  Another phenomenon was well pronounced in this generation, but I believe had occurred previously to a slight extent; namely, that most of the flowers on the self-fertilised plants were somewhat monstrous.  The monstrosity consisted in the corolla being irregularly split so that it did not open properly, with one or two of the stamens slightly foliaceous, coloured, and firmly coherent to the corolla.  I observed this monstrosity in only one flower on the crossed plants.  The self-fertilised plants, if well nourished, would almost certainly, in a few more generations, have produced double flowers, for they had already become in some degree sterile. (2/1.  See on this subject ‘Variation of Animals and Plants under Domestication’ chapter 18 2nd edition volume 2 page 152.)

Table 2/10.  Ipomoea purpurea (Ninth Generation).

Heights of Plants in inches: 

Column 1:  Number (Name) of Pot.

Column 2:  Crossed Plants.

Column 3:  Self-fertilised Plants.

Pot 1 :  83 4/8 :  57. 
Pot 1 :  85 4/8 :  71. 
Pot 1 :  83 4/8 :  48 3/8.

Pot 2 :  83 2/8 :  45. 
Pot 2 :  64 2/8 :  43 6/8. 
Pot 2 :  64 3/8 :  38 4/8.

Pot 3 :  79 :  63. 
Pot 3 :  88 1/8 :  71. 
Pot 3 :  61 :  89 4/8.

Pot 4 :  82 4/8 :  82 4/8. 
Pot 4 :  90 :  76 1/8.

Pot 5 :  89 4/8 :  67. 
Pot 5 :  92 4/8 :  74 2/8. 
Pot 5 :  92 4/8 :  70. 
Crowded plants.

Total :  1139.5 :  897.0.

Crossed and self-fertilised plants of the tenth generation.

Six plants were raised in the usual manner from the crossed plants of the last generation (Table 2/10) again intercrossed, and from the self-fertilised again self-fertilised.  As one of the crossed plants in Pot 1 in Table 2/11 became much diseased, having crumpled leaves, and producing hardly any capsules, it and its opponent have been struck out of the table.