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Abutilon acid Adolf Mayer agar agar plate albinism Amerongen anaerobes appears artificial infection bacteria bacteriological Bacterium become diseased Beijerinck Botanical bunt mosaic candle filtrate cells chlorophyll color conclusion contagium cultivation culture dark-green described develop disease of tobacco diseased leaves diseased plants diseased tobacco entirely Erwin Baur extracted juice fectious field filter paper filter-candles filtration fluidum Formalin fungus grafting granulase grow growers growth healthy plants hot beds infection infectious chlorosis infectious diseases inoculated Ivanowski known later leaf Lindemuth living organisms malformed maltase Malvaceae manure microbes mosaic disease Mosaikkrankheit negative results normal nutrition observed parasites phloem phosphoric acid Plate pock disease possible pots produced quantity question remained reproduce Rhenen roots rosette sap of diseased seed seems soil spot disease stage stem substance symptoms tion tissues tobacco disease tobacco leaves tobacco mosaic tobacco plant transmission transplanted twigs variegation veins virulence virus viruses Wageningen xylem yellow