A very curious subject, closely connected with serpent-charming, is the power of extracting venom from a wound inflicted by reptiles, attributed to the "snake-stone," which the Hindoos and Cingalese usually carry with them. Captain Napier thus describes it:-- "These people generally have for sale numbers of _snake-stones_, which are said to be equally an antidote against the bite of the serpent and the sting of the scorpion. For the former I have never seen it tried: and to prove its efficacy with the latter, the samp-wallah generally carries about in small earthen vessels a number of these animals, one of which he allows to wound him with his sting. The snake-stone, which is a dark, shining, smooth pebble, about the size and shape of a French bean, on being applied to the wound, instantly adheres to it, and by a power of suction appears to draw out the poison, which is supposed to be contained in the small bubbles which, on the immersion of the stone into a glass of water are seen in great numbers to rise to the surface. "My first idea on beholding the samp-wallah allow himself to be stung by the scorpion was that the latter had by some means been rendered harmless. However, not wishing voluntarily to put this to the test by personal experience, I purchased some of the stones, resolved on the very first opportunity to try their efficacy. Shortly after this, happening to be marching up the country with a detachment, we pitched our camp on some very stony ground, in clearing which one of the English soldiers happened to be bit [stung] in the hand by a large scorpion. As soon as I heard of this circumstance, I sent for the sufferer, who appeared to be in great pain, which he described as a burning sensation running all the way up his arm to the very shoulder. "I applied one of the snake-stones to the puncture; it adhered immediately, and during about eight minutes that it remained on the patient, he by degrees became easier; the pain diminished, gradually coming down from the shoulder, until it appeared entirely confined to the immediate vicinity of the wound. I now removed the stone; on putting it into a cup of water, numbers of small air-bubbles rose to the surface, and in a short time the man ceased to suffer any inconvenience from the accident."[201] It is scarcely needful to say that the emission of bubbles is a most ordinary phenomenon, and could have not the slightest connexion with the alexipharmic power of the stone, whether real or imaginary. Any one may see exactly the same thing on dropping a bit of new flower-pot, or a very dry brick into water, or any other substance heavier than the fluid, which is at the same time dry and porous. It results from the air which is contained in the pores of the material, which on immersion is displaced by the heavier water, and rises in oozing bubbles to the surface.