Chap. VI. ANAGALLIS COLLINA. 217 



In the following year the crossed plants again bore many 

 flowers before the self-fertilised bore a single one. The three 

 tallest flower-stems on the crossed plants in each of the pots 

 were measured, as shown in Table XCI. In Pots I. and II. the 

 self-fertilised plants did not produce a single flower-stem ; in 

 Pot IV. only one ; and in Pot III. six, of which the three tallest 

 were measured. 



The average height of the twelve flower-stems on the crossed 

 plants is 9 - 99, and that of the four flower-stems on the self- 

 fertilised plants 7 "37 inches ; or as 100 to 74. The self- fertilised 

 plants were miserable specimens, whilst the crossed ones looked 

 very vigorous. 



Anagallis. 



Anagallis collina, var. grandiflora (pale red and blue-flowered 

 sub-varieties). 



Firstly, twenty-five flowers on some plants of the red variety 

 were crossed with pollen from a distinct plant of the same 

 variety, and produced ten capsules ; thirty-one flowers were 

 fertilised with their own pollen, and produced eighteen capsules. 

 These plants, which were grown in pots in the greenhouse, were 

 evidently in a very sterile condition, and the seeds in both 

 sets of capsules, especially in the self-fertilised, although 

 numerous, were of so poor a quality that it was very difficult 

 to determine which were good and which bad. But as far as I 

 could judge, the crossed capsules contained on an average 6 - 3 

 good seeds, with a maximum in one of thirteen; whilst the 

 self- fertilised contained 6 05 such seeds, with a maximum in 

 one of fourteen. 



Secondly, eleven flowers on the red variety were castratod 

 whilst young and fertilised with pollen from the blue variety, 

 and this cross evidently much increased their fertility ; for the 

 eleven flowers yielded seven capsules, which contained on an 

 average twice as many good seeds as before, viz., 12*7; with a 

 maximum in two of the capsules of seventeen seeds. Therefore 

 these crossed capsules yielded seeds compared with those in the 

 foregoing self-fertilised capsules, as 100 to 48. These seeds wero 

 also conspicuously larger than those from the cross between two 

 individuals of the same red variety, and germinated much more 

 freely. The flowers on most of the plants produced by the cross 

 between the two-coloured varieties (of which several were raised),, 



