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ON THE VIRTUES OF FABULOUS STONES 191
the Department of Ethnology of the Columbian Exposition held in Chicago, in 1893. They are frequently found at Lake Constance but are from the ancient fossiliferous formations and not from the lake. They are often sold as amulets.
Fossils whose form suggested that of a more or less acutely pointed shaft, were thought to possess special powers, sometimes offensive as against enemies, and again defensive for the protection of the wearer. Thus the belemnites,72 considered to represent the form of a dart, when dissolved and taken as a potion, were said to prevent nightmare and to guard against enchantments. They are often either ash-colored or whitish, and sometimes reddish-black. All these varieties were frequently found during the sixteenth century in Hildesheim, and in the marble grotto near the castle of Marienburg, called the "Dwarf's Grotto."73
The umbilicus marinus, a fossil shell, which in form bore a great like­ness to the human navel, was called "sea-bean" by sailors. Usually of a pale saffron hue, some specimens have a reddish or blackish tinge. In the sixteenth century it was believed to have astringent properties. We are also told that women used it as one of the ingredients of a cosmetic for whitening the complexion.74
" This is the fossilized horny part of the tail of an extinct cuttlefish, and numerous specimens have been found in the marl of New Jersey as well as in many other places.
"Gesneri, " De flguris lapidum," Tiguri, 1565, fol. 89, verso, 90, recto.
"Mercati, " Metallotheca Vaticana," Romœ, 1719, pp. 13S-139. Figure on p. 138.