by Martinus W. Beijerinck
(click here for a biographical sketch of the author)
This paper, published in 1942 as part of the APS book Phytopathology Classic, Number 7, is offered here in its entirety. The paper is presented as a pdf (Adobe Acrobat) file to preserve its original look and feel. It is fully searchable using the find function of the Acrobat Reader. To download this Phythopathology Classic article, click here.
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