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taken from the concluding paragraph of the Introduction to this thesis: ... The discovery of the fertilizing value of sulfur by accident in the application of sulfur to plants as a fungicide, has led several investigators both in Europe and America to conduct experiments during the last decade with a view of determining more accurately the action of sulfur in plant nutrition. To date, the work has not, on the whole, been conclusive nor exhaustive, and it was with the idea of studying the role of this element still further that the following work was undertaken.

Some biological and chemical effects of sulfur upon plant growth and upon the soil