Page:Popular Science Monthly Volume 78.djvu/484

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474

THE POPULAR SCIENCE MONTHLY

Table I

Table I (Continued)

Table I. Showing Advance in Knowledge regarding some of the Chief Plant Diseases. The broken upper line indicates vague or indefinite knowledge; the solld line definite knowledge. The lower broken line indicates partial but unsatisfactory knowledge concerning treatment; the solid line the possession of facts sufficient for satisfactory treatment.

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