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SummaryDaily sperm production (DSP) in sexually mature rabbits was estimated to be 40.5 × 106/g of testis parenchyma or 187 × 106/animal. The daily sperm output (DSO) during a collection regimen of 2×/48 hr was 90.2 × 106 sperm/buck, accounting for 48% of the DSP. Up to 70% of DSP was accounted for by ejaculated sperm plus sperm in the urine. When the same group of males was sexually rested for an extended period 82% of the DSP was accounted for in the urine. The sperm unaccounted for may be resorbed or in part result from small errors of estimation. During the period of sexual rest sperm were voided in the urine in a cyclical pattern.In another group of males sexually rested for 36 days only 10% of the DSP was found in urine, indicating that a majority of sperm were resorbed. Thus, resorption of sperm in recently filled epididymides may be greater initially than after prolonged periods of sexual rest.The authors are grateful to Gary Anderson, Dick Cole, Janet Wiebold, Elvira Osirio de Valdivia, Lynne Deu...

Early in the course of a study of the blood iodine levels in various disorders, it became apparent that patients with myeloid leukemia differed from those with leukemia of the lymphatic type in respect to their blood iodine.An elevation of the blood iodine in a case of lymphatic leukemia was reported by Veil and Sturm.1 Curtis and his associates have stated2, 3 that the blood iodine is increased in both lymphatic and myeloid leukemia, but in one case of chronic myeloid leukemia in whom the urinary loss of iodine was studied the blood iodine was approximately normal.4 Dassen and del Castillo5 found a high blood iodine in 2 cases of myeloid leukemia. Stevens,6 using a method similar to the one employed by us found a normal value for the blood iodine in one case of lymphatic leukemia. Summarizing, it is fair to say that the prevailing impression, based on some half dozen cases in the literature, seems to be that the blood iodine is elevated in leukemia regardless of type.We have made blood iodine determinati...