Franklin, Benjamin. Memoirs of the culture of silk.
"About 2500 years before Christ, the Empress Siling began the Culture of Silk in China, where it was confined near 2000 Years, before it reached India and Persia.
That Part of the Imperial Revenue in China paid in Silk, amounts to above 955,000Ib. Troy, and perhaps this is not the twentieth Part of the Produce of that Empire. One Million of Trees disposed into Mulberry Walks, in Pennsylvania, would in a few Years, enable a yearly Remittance to Great-Britain of a Million Sterling, and no Ways interfere with the other necessary Branches of Labour in the Community."
Literature : Occident : United States of America