potter's earth
Example Sentences
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The mineral products comprise lignite, limestone, gypsum, alum and potter’s earth; barley and rye are the usual cereals; fruits and vegetables are abundant; and considerable quantities of hemp, flax, hops and tobacco are raised.
From Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 4 "Bradford, William" to "Brequigny, Louis" by Various
If you will have pure carbon, carbuncle, or diamond, to make the brain transparent, the trunk and organs shall be so much the grosser: instead of porcelain, they are potter's earth, clay, or mud.
From Representative Men by Emerson, Ralph Waldo