In reference to the relative amount of pollen produced by a large and small stamen, Halstead has given a note, in his paper in the Botanical Gazette.[P] The material in the hands of the writers at the time of the writing of this paper is not suitable for a verification of Mr. Halstead’s results; consequently they are simply quoted on his authority. Even if the amount of pollen produced by the large anther is no greater than that produced by one of the smaller, it is still very considerable, as may be readily seen by tapping it out on a glass slip. He says: “The single large stamen of _Solanum rostratum_, with its beak-like appearance, is a giant among its fellows, but does not exceed them in the production of pollen, for, while three or four times larger than the others, its thecæ are reduced to narrow, curved lines of mother-cells. The ordinary stamens, on the other hand, possess unusually large cavities in which the pollen is borne. The giant stamen, in cross-section, is shown at _a_, in fig. 3, while a similar section of an ordinary stamen is shown at _b_. The almost infertile condition of the large stamen reminds one of the structure of the stamens of the cultivated potatoes. In these, while large and plump, there is almost no pollen-bearing layer, and usually no apical pore opens for the discharge of pollen.” In _C. marilandica_, as Meehan has shown, autogamy is impossible, while in _S. rostratum_ autogamy may possibly sometimes take place. The bee visits the flower for pollen; contrary, however, to the statement of Professor Todd, that “the flowers have neither nectar nor odor,” the writers observed that, especially in the early morning, the odor was decidedly pronounced. It was observed that the bee collected no pollen from the large stamen, but took it regularly from the four smaller. This it did by grasping the anthers, one at a time, near the base, and forcing the pollen out through the terminal pores, by pinching it throughout the length between its mandibles. An exception to this in the case of _Agapostemon texanus_ Cress, is already noted in the list of species. It will be remarked that our observations on this point correspond in general to those of Professor Todd.