. Preventive medicine and hygiene. ALGAE: I, Clathrocystis- x500/ 2, Anabaena-x 500- 3 OSCILLATORIA-X 500: 4 , ASTER ION E LLA-X 500 ; S Navigula showing structure ok diatom -X 500. Fig 104.—Algae Commonly Found in Watkr. |Yeae Booi, V-. S. Dept. of Agr., 1902.] 825

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Keywords: ., bookauthorwh, bookcentury1900, bookdecade1910, booksubjecthygiene