THE VARIETIES OF FERTILISATION. 327 



relative fertility of the self-fertilised had risen from zero in 

 Brazil to 15, and then to 866 pc, in comparison with the 

 crossed regarded as 100. 



He now made crossings between the offspring of the 

 Brazilian plants and the English-grown plants, with the 

 following results : — 



First, as to heights, — 



The English-crossed to the self -fertilised plants 100:109 



The English-crossed to the intercrossed * plants ... ... 100: 94 



The intercrossed to the self -fertilised plants ... ... ... 300:116 



Secondly, as to weights, — 



The English-crossed to the self -fertilised plants 100 : 118 



The English-crossed to the intercrossed plants ... ... 100:100 



The intercrossed to the self -fertilised plants 100:118 



Three rows of plants of each kind grew in the open ; and 

 here also the self-fertilised grew taller than the others. 

 Moreover, all except three of the self -fertilised were killed 

 by the winter. 



" We thus see that the self -fertilised plants which were 

 grown in the nine pots were superior in height (as 116 : 100) 

 and in weight (as 118 : 100), and apparently in hardiness, to 

 the intercrossed plants derived from a cross between the 

 grandchildren of the Brazilian stock. The superiority is 

 here much more strongly marked than in the second trial 

 with the plants of the English stock, in which the self- 

 fertilised were to the crossed in height as 101 : 100. It is 

 a far more remarkable fact . . . that the self- fertilised plants 

 exceeded in height (as 109:100), and in weight (as 118 : 100), 

 the offspring of the Brazilian stock crossed by the English 

 stock." 



* "Intercrossed" signifies the ofifspring of the Brazilian plants 

 crossed with one another. 



