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THere is a little Stone found in these Islands, most com∣monly neer the Sea∣side, and sometimes at a good di∣stance from the Sea, which from its vertues may be termed the Eye-stone; but in regard the more common opinion will have it to be a production of the waters, we shall treat of it in this place. Some of these Stones are about the bigness of the larger sort of Brass-farthings; but the least are most esteem'd: A man would think, looking on them in the Sun, that they were
of those Pearls called Barroques cut in two, they are so cleer, transparent, and smooth: Some of them have red or blewish veins, which give them a very delightful lustre, according to the several aspects are cast on them: They have the figure of a Snail engrav'd on that side which is even: Being put under the eye-lid, they roll about the ball of the eye, and it is affirm∣ed, that they strengthen and cleer the sight, and force thence the motes, or trash which might have fallen into it.