, Artificial Manures--Bones--Boiled and Steamed Bones--Mineral Phosphates--English Coprolites--French and Spanish Phosphorites--German and Belgian Phosphates--Basic Slag--Guanos Proper--Guano Phosphates. [Please select]
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In England the favorite source of phosphates of lime is the "Cambridge coprolites." [Please select]
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Similar coprolites are found and mined in other districts of England, but they are of inferior quality, containing more oxide of iron and alumina. [Please select]
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The Cambridge coprolites are so much esteemed that buyers of artificial manure often stipulate that it shall be made from them. [Please select]
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