Cocoon of Bombyx Mori Drawn in Toward the Middle
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The best silkworm cocoons “are drawn in toward the middle, or have a concavity on either side. There are white and yellow cocoons, the produce of different species of worms.”
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Lepidoptera: Moths and ButterfliesSource
Hazlitt Alva Cuppy PH.D., Editor Beauties and Wonders of Land and Sea (Springfield, OH: Mast, Crowell & Kirkpatrick, 1895)
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