One plant was observed upon which occurred fifty-five to sixty racemes. Allowing the low average of six pods to the raceme, the plant will produce in the neighborhood of 20,000 seeds. Occasionally a very large plant is observed which produces as many as 125 racemes. Allowing the same low average of six pods to the raceme, it will be seen that on a plant of this size there will be produced in the neighborhood of 40,000 seeds. Only a very small proportion of the ovaries fail to develop. Out of the forty-one racemes observed in five plants, taken at random in different localities, results were obtained as follows: Plant 1, 5 racemes, 53 pods, 4 failed. " 2, 5 " 42 " 3 " " 3, 9 " 55 " 5 " " 4, 11 " 91 " 6 " " 5, 11 " 121 " 5 " —— ——— —— 41 racemes, 367 pods, 23 failed, or 6.2 per cent. According to these figures, not more than 6.2 per cent. of the ovaries failed to be fertilized. While _Cassia chamæcrista_ is usually abundant in Douglas county, owing, probably, largely to the severe drought, opportunities for study were not nearly so favorable as for _Solanum_. The material studied was found growing, for the most part, in somewhat shaded localities on the banks of Lake View. Professor Todd has given very well the points in the structure of the flower of this species. He says: “The points that are of interest to us are the sickle-shaped pistil, the stamens with long, rigid anthers opening by terminal pores, and the most of them pointed toward the incurved petal, which is always on the opposite side from the pistil.” The flowers are arranged in small clusters a little above the axils of the leaves. In some cases the axillary bud also develops into a flower cluster. The axillary clusters have been considered separately in the calculations made upon the conditions of the flowers. Owing to the lack of material, Professor Todd was unable to determine any definite law governing the arrangement of the flowers in _C. chamæcrista_. This the writers have attempted to do. The determination of any law governing the order of development of the flowers in a plant like _C. chamæcrista_, where they are arranged in clusters developed from buds produced on the main axis, and the development of which is probably accelerated or retarded by various conditions, is much more difficult than in _S. rostratum_, where they are produced on a definite raceme, which is early differentiated from the terminal growing point, and at first develops more rapidly than the bud which is to continue the main axis of the branch.[R] TABLE D. (Part 1)