BALLS of Silk-worms and Spiders, are little cases or cones of silk, wherein those insects deposit their eggs. Spiders are extremely tender of their balls, which they carry about with them, adhering to the papillae about their anus. Grew mentions balls or bags of a species of silk-worms in Virginia as big as hens eggs, and containing each four aurelias.
Zoologists speak of a sort of balls of hair covered over with a smooth shining coat or shell, found in the stomachs of oxen, cows, calves, horses, sheep, and goats. See the article BEZOAR.