84 



DIGITALIS PUKPUREA. 



CHAP. Ill 



TABLE XXIIL 



The tallest Flower-stem on each Plant measured : means that 

 the Plant died before a Flower-stem was produced. 



The average height of the flower-stems of the sixteen crossed 

 plants is here 51 '33 inches; and that of the eight self-fertilised 

 plants, 35-87 ; or as 100 to 70. But this difference in height does 

 not give at all a fair idea of the vast superiority of the crossed 

 plants. These latter produced altogether sixty-four flower-stems, 

 each plant producing, on an average, exactly four flower-stems ; 

 whereas the eight self-fertilised plants produced only fifteen 

 flower-stems, each producing an average only of 1'87 stems, and 

 these had a less luxuriant appearance. We may put the result in 

 auother way : the number of flower-stems on the crossed plants was 

 to those on an equal number of self-fertilised plants as 100 to 48. 



Three crossed seeds in a state of germination were also planted 

 in three separate pots; and three self-fertilised seeds in the 

 same state in three other pots. These plants were therefore 

 at first exposed to no competition with one another, and when 



