3. Specimen soft magma of the pool margin. Oedogonium abundant, spores, yeast plants, dirt. 4. Sand scraped. No organized forms but pollen, and mobile spores of some cryptogams. 5. Dew on grass. One stellate compound plant hair, one Gemiasma verdans, two pollen. 6. Grass flower dew. Some large white sporangia filled with spores. 7. Grass blade dew, not anything of account. One pale Gemiasma, three blue Gemiasmas, Cosmarium, Closterium. Diatoms, pollen, found in greenish earth and wet with the dew. Remarks: Observations made at the pool with clinical microscope, one-quarter inch objective. Day cloudy, foggy, hot. 8. Green earth in water way from pump near cemetery. Anabaina plentiful. Diatoms, Oscillatoriaceæ. Polycoccus species. Pollen, Cosmarium, Leptothrix, Gemiasma, old sporangia, spores many. Fungi belonging to fruit. Puccinia. Anguillula fluviatilis. 9. Mr. Smith's blood. Spores, enlarged white corpuscles. Two sporangia? Gemiasma dark brown, black. Mr. Smith is superintendent Congressional Cemetery. Lived here for seven years. Been a great sufferer with ague. Says the doctors told him that they could do no more for him than he could for himself. So he used Ayer's ague cure with good effect for six months. Then he found the best effect from the use of the Holman liver ague pad in his own case and that of his children. From his account one would infer that, notwithstanding the excellence of the ague pad, when he is attacked, he uses blue mass, followed with purgatives, then 20 grains of quinine. Also has used arsenic, but it did not agree with him. Also used Capsicum with good results. Had enlarged spleen; not so now. 2d specimen of Mr. Smith's blood. Stelline, no Gemiasma. 3d specimen, do. One Gemiasma. 4th specimen. None. 5th specimen. Skin scraped showed no plants. 6th specimen. Urine; amyloid bodies; spores; no sporangia. United States Magazine store grounds. Observation 1. Margin of Eastern Branch River. Substance from decaying part of a water plant. Oscillatoriaceæ. Diatoms. Anguillula. Chytridium. Dirt. No Gemiasma. Observation 2. Moist soil. Near by, amid much rubbish, one or two so-called Gemiasmas; white, clear, peripheral margin. Observation 3. Green deposit on decaying wood. Oscillatoriaceæ. Protuberans lamella, Gemiasma alba. Much foreign matter. Mr. Russell, Mrs. R., Miss R., residents of Magazine Grounds presented no ague plants in their blood. Sergeant McGrath, Mrs. M., Miss M., presented three or four sporangias in their blood. Dr. Hodgkins, some in urine. Dr. H.'s friend with chills, not positive as to ague. No plants found. Observations in East Greenwich, R.I., Aug. 16, 1877. 1. At early morn I examined greenish earth, northwest of the town along the margin of a beautiful brook. Found the Protuberans lamella, the Gemiasma alba and rubra. Observation 2. Found the same. Observation 3. Found the same. Observation 4. Salt marsh below the railroad bridge over the river.