The first and second experiments had primarily the object of proving the composition of the hybrid egg cells, while the third and fourth experiments were to decide that of the pollen cells[40]. As is shown by the above demonstration the first and second experiments and the third and fourth experiments should produce precisely the same combinations, and even in the second year the result should be partially visible in the form and colour of the artificially fertilised seed. In the first and third experiments the dominant characters of form and colour, _A_ and _B_, appear in each union, and are also partly constant and partly in hybrid union with the recessive characters _a_ and _b_, for which reason they must impress their peculiarity upon the whole of the seeds. All seeds should therefore appear round and yellow, if the theory be justified. In the second and fourth experiments, on the other hand, one union is hybrid in form and in colour, and consequently the seeds are round and yellow; another is hybrid in form, but constant in the recessive character of colour, whence the seeds are round and green; the third is constant in the recessive character of form but hybrid in colour, consequently the seeds are angular and yellow; the fourth is constant in both recessive characters, so that the seeds are angular and green. In both these experiments there were consequently four sorts of seed to be expected--viz. round and yellow, round and green, angular and yellow, angular and green. [40] [To prove, namely, that both were similarly differentiated, and not one or other only.] The crop fulfilled these expectations perfectly. There were obtained in the 1st Experiment, 98 exclusively round yellow seeds; 3rd " 94 " " " " In the 2nd Experiment, 31 round and yellow, 26 round and green, 27 angular and yellow, 26 angular and green seeds. In the 4th Experiment, 24 round and yellow, 25 round and green, 22 angular and yellow, 27 angular and green seeds. A favourable result could now scarcely be doubted; the next generation must afford the final proof. From the seed sown there resulted for the first experiment 90 plants, and for the third 87 plants which fruited: these yielded for the-- 1st Exp. 3rd Exp. 20 25 round yellow seeds _AB_ 23 19 round yellow and green seeds _ABb_ 25 22 round and angular yellow seeds _AaB_ 22 21 round and angular green and yellow seeds _AaBb_ In the second and fourth experiments the round and yellow seeds yielded plants with round and angular yellow and green seeds, _AaBb_. From the round green seeds plants resulted with round and angular green seeds, _Aab_. The angular yellow seeds gave plants with angular yellow and green seeds, _aBb_. From the angular green seeds plants were raised which yielded again only angular and green seeds, _ab_.