On the first foot of ground, then, there might be produced in the neighborhood of 1300 seeds; on the second, 2600. The large _Solanum_ upon which 40,000 seeds were estimated would probably cover an area of 12.5 square feet, giving 3200 seeds per square foot. Of course, these figures represent only certain isolated cases, which in a way are typical, but must not be taken to represent the average condition. The largest plant noted September 4 had produced 100 pods, with an average of thirteen seeds per pod; this plant might show 1300 seeds. Professor Todd discusses in his paper the occurrence of similar divergences from the typical form in other Solanaceæ and Leguminosæ, and tries to discover some hint as to their origin. Lack of material for observation precludes any present discussion of these points. The results of these observations may be briefly summarized as follows: Solanum rostratum. 1. As Professor Todd observed, the numbers of right-and left-handed flowers on a plant of any considerable size are about equal. 2. As a general rule, only one flower opens at a time on a raceme, but very commonly two will open on the raceme the same morning, giving a right-and left-handed flower opening simultaneously, and thus permitting in a considerable number of cases pollination between flowers on the same raceme, even if Professor Todd’s theory of the method of pollination be the correct one. 3. Even on the smaller branches of the plant, the flowers are almost always approximately divided into the two types. 4. The flower has a distinct odor. 5. Various species of insects visit the flowers for pollen. Many insects secure pollen without effecting pollination. 6. In a rather hasty microscopic examination, no very apparent difference was detected between the pollen from large and small stamens. 7. A very important function of the observed arrangement of stamen and pistil in _S. rostratum_ seems to the writers to be that of support for the visiting insect. 8. It might seem that the pollen from the small stamens is of much more importance in the process of fertilization than Professor Todd suspected, especially since it seems that there is much more certainty of the pollen from the small stamens reaching the pistil than there is of that from the large stamen. The fact that there is some question as to the fertility of the pollen from the large stamen in all cases, and that in the case of another plant stamens of somewhat similar arrangement seem to have lost entirely their direct reproductive function, would indicate the same. 9. In a limited number of cases the pollen from the large stamen of a flower seems to be fertile on its own stigma, as well as upon the stigma of a flower opening simultaneously on the opposite side of raceme. 10. Spontaneous self-pollination seems sometimes to occur.