1. This experiment has been carried out on the development of seeds in the pod of the peanut. 2. Both the average number of the ovules in the ovary and the retio between the two-ovule and the three-ovule pods have been seemed almost invariable and fixed in each variety and neither were influenced by the efflorescence time on the same stock. 3. The growth of the abnormal seeds in the incipient stage of seed growth sddmed to vary in each variety. Valencea variety has been found most subject to such growth. But such a thing has not been founded in any variety in the desinent stage of growth. 4.The abnormal growth in the incipient stage of the three-and four-seeded pods in Valencia variety plants has been found most frequently at the basal position in the pod, while the abnormal growth in the desinent stage has been found mostly at the tip position of the pod. 5. It may be said with Valencia variety that the more numerously the seeds are contained in a single pod, the more frequently, though not in a marked degree, was the unusual growth in the incipient stage. But such growth was not found with the two-seeded pods. 6. The microscopic obsevations of the abnomal seeds in the incipient stage seemed to reveal that at least the fertilization was acomplished on most of them, but, they soon stopped theirgr owth and finally turned into degeneration.