theoldstone:Adder Stones (sometimesalso called hag stones, witch stones, serpent’s eggs, snake’s egg
theoldstone:Adder Stones (sometimesalso called hag stones, witch stones, serpent’s eggs, snake’s eggs, GlainNeidr, Milpreve, adderstanes, Gloine nan Druid, aggry, or aggri) are stones,usually smooth or glassy, with a naturally occurring hole bored straight throughit, typically from water erosion or natural damage.That said, there are no shortage of stories claiming thesestones have a more unnatural origin. One claims that they are formed from thehardened saliva of a great number of serpents, massed together, and the holesare from their tongues. Another claims the stones are actually the heads ofsnakes.Adder stones feature prominently in Welsh mythology andDruidic culture. They were believed to have magical powers and thought toprotect people from a gamut of problems, ranging from eye diseases, evilcharms, nightmares, whooping cough, and snake bites. It was also believed thatif you looked through the hole in an adder stone, you could see through thedisguise of a fairy or witch. -- source link