CHAP. VII. TABLE O. 267 



However this may be, plants raised from self-fertilised 

 plants of the third generation crossed by a slightly 

 different sub-variety, exceeded greatly in height and 

 weight the self-fertilised plants of the fourth genera- 

 tion ; and the trial was made on a large scale. They 

 exceeded them in height when grown in pots, and not 

 much crowded, in the ratio of 100 to 66 ; and when 

 much crowded, as 100 to 54. These crossed plants, when 

 thus subjected to severe competition, also exceeded 

 the self-fertilised in weight in the ratio of 100 to 37. 

 So it was, but in a less degree (as may be seen in 

 Table C), when the two lots were grown out of doors 

 and not subjected to any mutual competition. Never- 

 theless, strange as is the fact, the flowers on the 

 mother-plants of the third self-fertilised generation 

 did not yield more seed when they were crossed with 

 pollen from plants of the fresh stock than when they 

 were self-fertilised. 



(11.) Anagallis collina. Plants raised from a red 

 variety crossed by another plant of the same variety 

 were in height to the self-fertilised plants from the 

 red variety as 100 to 73. When the flowers on the 

 red variety were fertilised with pollen from a closely 

 similar blue-flowered variety, they yielded double the 

 number of seeds to what they did when crossed by 

 pollen from another individual of the same red variety, 

 and the seeds were much finer. The plants raised 

 from this cross between the two varieties were to the 

 self-fertilised seedlings from the red variety, in height 

 as 100 to 66, and in fertility as 100 to 6. 



(12.) Primula veris. Some flowers on long-styled 

 plants of the third illegitimate generation were legiti- 

 mately crossed with pollen from a fresh stock, and 

 others were fertilised with their own pollen. From 

 the seeds thus produced crossed plants, and self- 



