| http://www.w3.org/ns/prov#value | - This compound, in most cases, has been formed in the burning, from humate and other organic salts of lime. _Sand_, or _clay_, being insoluble in the acid, remains, and may be readily estimated. _Phosphoric acid_ and alkalies, especially _potash_, are, next to lime, the important ingredients of the ash. _Magnesia_ and _sulphuric acid_, rank next in value.
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