I should here state that it has been found convenient to reserve for separate discussion the cases of flowers which are usually quite sterile with their own pollen.
TABLE 9/f.--relative fertility of the flowers on the parent-plants used in my experiments, when fertilised with pollen from a distinct plant and with their own pollen. Fertility judged of by the average number of seeds per capsule. Fertility of crossed flowers taken as 100.
Column 1: Name of plant and feature observed.
Column 2: x, in the expression 100 to x.
Ipomoea purpurea--crossed and self-fertilised flowers yielded seeds as (about): 100.
Mimulus luteus--crossed and self-fertilised flowers yielded seeds as (by weight): 79.
Linaria vulgaris--crossed and self-fertilised flowers yielded seeds as: 14.
Vandellia nummularifolia--crossed and self-fertilised flowers yielded seeds as: 67?
Gesneria pendulina--crossed and self-fertilised flowers yielded seeds as (by weight): 100.
Salvia coccinea--crossed and self-fertilised flowers yielded seeds as (about): 100.
Brassica oleracea--crossed and self-fertilised flowers yielded seeds as: 25.
Eschscholtzia californica--(English stock) crossed and self-fertilised flowers yielded seeds as (by weight): 71.
Eschscholtzia californica--(Brazilian stock grown in England) crossed and self-fertilised flowers yielded seeds (by weight) as (about): 15.
Delphinium consolida--crossed and self-fertilised flowers (self-fertilised capsules spontaneously produced, but result supported by other evidence) yielded seeds as: 59.
Viscaria oculata--crossed and self-fertilised flowers yielded seeds as (by weight): 38.
Viscaria oculata--crossed and self-fertilised flowers (crossed capsules compared on following year with spontaneously self-fertilised capsules) yielded seeds as : 58.
Dianthus caryophyllus--crossed and self-fertilised flowers yielded seeds as: 92.
Tropaeolum minus--crossed and self-fertilised flowers yielded seeds as: 92.
Tropaeolum tricolorum--crossed and self-fertilised flowers yielded seeds as: 115. (9/1. Tropaeolum tricolorum and Cuphea purpurea have been introduced into this table, although seedlings were not raised from them; but of the Cuphea only six crossed and six self-fertilised capsules, and of the Tropaeolum only six crossed and eleven self-fertilised capsules, were compared. A larger proportion of the self-fertilised than of the crossed flowers of the Tropaeolum produced fruit.)
Limnanthes douglasii--crossed and self-fertilised flowers yielded seeds as (about): 100.
Sarothamnus scoparius--crossed and self-fertilised flowers yielded seeds as: 41.
Ononis minutissima--crossed and self-fertilised flowers yielded seeds as: 65.
Cuphea purpurea--crossed and self-fertilised flowers yielded seeds as: 113.
Passiflora gracilis--crossed and self-fertilised flowers yielded seeds as: 85.
Specularia speculum--crossed and self-fertilised flowers yielded seeds as: 72.
Lobelia fulgens--crossed and self-fertilised flowers yielded seeds as (about): 100.
Nemophila insignis--crossed and self-fertilised flowers yielded seeds as (by weight): 69.
Borago officinalis--crossed and self-fertilised flowers yielded seeds as: 60.
Nolana prostrata--crossed and self-fertilised flowers yielded seeds as: 100.
Petunia violacea--crossed and self-fertilised flowers yielded seeds as (by weight): 67.
Nicotiana tabacum--crossed and self-fertilised flowers yielded seeds as (by weight): 150.
Cyclamen persicum--crossed and self-fertilised flowers yielded seeds as: 38.
Anagallis collina--crossed and self-fertilised flowers yielded seeds as: 96.
Canna warscewiczi--crossed and self-fertilised flowers (on three generations of crossed and self-fertilised plants taken all together) yielded seeds as: 85.
Table 9/G gives the relative fertility of flowers on crossed plants again cross-fertilised, and of flowers on self-fertilised plants again self-fertilised, either in the first or in a later generation. Here two causes combine to diminish the fertility of the self-fertilised flowers; namely, the lesser efficacy of pollen from the same flower, and the innate lessened fertility of plants derived from self-fertilised seeds, which as we have seen in the previous Table 9/D is strongly marked.