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162 THE MAGIC OP JEWELS AND CHARMS
 
 

 
 
selves to an interpretation in line with the primitive adora­tion of the life-giving forces of nature, and suggested the use of such fossils to cure certain special diseases. Other of these petrifactions retaining the form of the enclosing shell, especially those of circular shape, and with concentric rings, were believed to be of meteoric origin and to have fallen during thunder or rain; hence the names of brontia and
ombria. A certain class of these fossils, with convolutions on the surface resembling the form of a snake, were called snake-eggs Uova anguina), and, very naturally, en­joyed the repute of preserving the wearer from poisons. All these varieties will be described in this and the following chapters.
While some believed at the toad-stone was vomited by the animal, others held that it consti­tuted a part of the toad's head. That this was the popular belief in Shakespeare's time is shown by the well-known lines in his "As You Like It" (Act II, sc. 1) : Which like the toad, ugly and venomous, Wears yet a precious jewel in his head.
De Boot, whose treatise was published about the time that Shakespeare wrote these lines, gives the following account of the result of his efforts to obtain a toad-stone according to the prescribed method :2
I remember that, when a boy, I took an old toad and set it upon a red cloth that I might secure a toadstone; for they say that it will not give up its stone unless it sits upon a red cloth. However, although I watched the' Anselmi Boetii de Boodt, " Gemmarum Historia," Honoviae, 1009, p. 52.