Samuel William Johnson

Samuel William Johnson (3 July 1830 Kingsboro, New York – 1909) was a U.S. American agricultural chemist. He promoted the movement to bring the sciences to the aid of American farmers through agricultural experiment stations and education in agricultural science.

Johnson, working in the 19th century, covered various aspects of farming that today would be called both organic and nonorganic. His work included exposing frauds in artificial manures (some of which would today be called chemical fertilizers).

Samuel was the son of Abner Adolphus Johnson and Annah Wells Gilbert. Abner was Samuel’s first teacher; later he studied with David Mayhew in a school at Lowville, New York. Early on he obtained a textbook on chemistry by Fresenius, in which he learned methods of analytical chemistry.

Gaining admission to Yale University, Samuel took lessons from John Pitkin Norton, Benjamin Silliman, Benjamin Silliman, Jr. and James Dwight Dana among others. Upon graduation he went to Leipzig, studying with Otto Linne Erdmann. The next year he went to Munich and Liebig's lab. He studied physiological chemistry with Max Joseph von Pettenkofer and Wolfgang Franz von Kobell. Returning through England, he visited the lab of Edward Frankland and the experimental farms of John Bennet Lawes and Joseph Henry Gilbert.

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