474
THE POPULAR SCIENCE MONTHLY
![](http://upload.wikimedia.org/wikipedia/commons/thumb/8/83/PSM_V78_D484_Advance_knowledge_of_the_spread_of_plant_diseases_1.png/540px-PSM_V78_D484_Advance_knowledge_of_the_spread_of_plant_diseases_1.png)
Table I
Table I (Continued)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/af/PSM_V78_D484_Advance_knowledge_of_the_spread_of_plant_diseases_2.png/540px-PSM_V78_D484_Advance_knowledge_of_the_spread_of_plant_diseases_2.png)
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.