In order to show how much more fertile each form is when legitimately fertilised with pollen from the other form (or in the case of trimorphic species, with the proper pollen from one of the two other forms) than when illegitimately fertilised with its own-form pollen, I will append Table 6.33 giving a summary of the results in all the cases hitherto ascertained. The fertility of the unions may be judged by two standards, namely, by the proportion of flowers which, when fertilised in the two methods, yield capsules, and by the average number of seeds per capsule. When there is a dash in the left hand column opposite to the name of the species, the proportion of the flowers which yielded capsules was not recorded. TABLE 6.33. Fertility of the legitimate unions taken together, compared with that of the illegitimate unions together. The fertility of the legitimate unions, as judged by both standards, is taken as 100. Column 1: Name of species. Column 2: Illegitimate unions : proportional number of flowers which produced capsules. Column 3: Illegitimate unions : average number of seeds per capsule. Primula veris : 69 : 65. Primula elatior : 27 : 75. Primula vulgaris : 60 : 54. Primula Sinensis : 84 : 63. Primula Sinensis (second trial) : 0 : 53. Primula Sinensis (Hildebrand) : 100 : 42. Primula auricula (Scott) : 80 : 15. Primula Sikkimensis (Scott) : 95 : 31. Primula cortusoides (Scott) : 74 : 66. Primula involucrata (Scott) : 72 : 48. Primula farinosa (Scott) : 71 : 44. Average of the nine species of Primula : 88.4 : 69. Hottonia palustris (H. Muller) : - : 61. Linum grandiflorum (the difference probably is much greater) : - : 69. Linum perenne : - : 20. Linum perenne (Hildebrand) : 0 : 0. Pulmonaria officinalis (German stock, Hildebrand) : 0 : 0. Pulmonaria angustifolia : 35 : 32. Mitchella repens : 20 : 47. Borreria, Brazilian sp. : - : 0. Polygonum fagopyrum : - : 46. Lythrum salicaria : 33 : 46. Oxalis Valdiviana (Hildebrand) : 2 : 34. Oxalis Regnelli : 0 : 0. Oxalis speciosa : 15 : 49.