CHAPTER XXV.
Dr. Vœlcker’s Experiments on Clover.-- Lawes and Gilbert’s on Wheat.-- Clover Roots per Acre.-- Manures for Wheat.-- Liebig’s Manure Theory.-- Peruvian Guano on Wheat.-- Manures and the Quality of Wheat.-- Ammonia.-- Over 50 Bushels of Wheat to the Acre. 135