CHAP. VII. TABLE A. 277 



self-fertilised, they flowered in both pots before them. It i 

 therefore probable that they had some real advantage over the 

 self-fertilised plants. 



(12.) Adonis cestivalis. The four crossed plants were almost 

 exactly equal in height to the four self-fertilised plants, but as 

 so few plants were measured, and as these were all " miserably 

 unhealthy," nothing can be inferred with safety with respect to 

 their relative heights. 



(13.) Bartonia aurea. The eight crossed plants were to the 

 eight self-fertilised in height as 100 to 107. This number of 

 plants, considering the care with which they were raised and 

 compared, ought to have given a trustworthy result. But from 

 some unknown cause they grew very unequally, and they be- 

 came so unhealthy that only three of the crossed and three 

 of the self-fertilised plants set any seeds, and these few in 

 number. Under these circumstances the mean height of neither 

 lot can be trusted, and the experiment is valueless. The cross- 

 fertilised flowers on the parent-plants yielded rather more seeds 

 than the self-fertilised flowers. 



(14.) T/iunbergia alata. The six crossed plants were to the 

 six self-fertilised in height as 100 to 108. Here the self-fertilised 

 plants seem to have a decided advantage ; but both lots grew 

 unequally, some of the plants in both being more than twice as 

 tall as others. The parent-plants also were in an odd semi- 

 sterile condition. Under these circumstances the superiority of 

 the self-fertilised plants cannot be fully trusted. 



(15.) N'Kana prostrata. The five crossed plants were to the five 

 self- fertilised in height as 100 to 105; so that the latter seem 

 here to have a small but decided advantage. On the other hand, 

 the flowers on the parent-plants which were cross-fertilised 

 produced very many more capsules than the self-fertilised flowers, 

 in the ratio of 100 to 21 ; and the seeds which the former con- 

 tained were heavier than an equal number from the self-fertilised 

 capsules in the ratio of 100 to 82. 



(16.) Hibiscus a/Hcanus Only four pairs were raised, and tie 

 crossed were to the self-fertilised in height as 100 to 109. 

 Excepting that too few plants were measured, I know of nothing 

 else to cause distrust in the result. The cross-fertilised 

 flowers on the parent-plants were, on the other hand, rather 

 more productive than the self-fertilised flowers. 



(17.) Apium petroselinum. A few plants (number not re- 

 corded) derived from flowers believed to have been crossed by 



