As he spoke he held up the head by the tail of the squirrel. The body of the little creature had begun to swell and filled the whole of the snake's mouth. Taking out a sharp knife and pressing the head of the snake with his axe, he cut open its jaws so as to expose both the upper and lower portions; by this means also he extracted the body of the squirrel. He then showed us its poison fangs, which, on removing the little animal, folded back into the upper jaw, on the sides of which they were placed. The points were as sharp and fine as needles. He then cut out from each side of the head, close to the root of the fangs, the venom-bags. "You see that, to enable the head to contain these bags, it is very much broader than that of the harmless snake," he observed. "We shall find the same breadth of head in all the venomous species. The bags contain between them about eight drops of poison, one of which would be sufficient, introduced into the blood, to kill a man or a horse. You see round the base of each fang, a mass of muscular tissue. By its means the fang is elevated or depressed. When the snake opens its mouth to strike its victim, the depressing muscles are relaxed, and the opposite series become contracted, causing the fangs to rise up ready for action. Now look through my magnifying glass. You see that the fang is hollow from the base to the point, from the former the poison is pressed up out of the poison-bag and exudes through the fang point, which, as you see, is in the form of a narrow slit on its concave side." "I don't see how any liquid could get through that," observed Dan. "It does though, and quite sufficient comes through to produce a deadly effect. The other teeth enable the serpent to hold its prey, but are not in communication with the poison-bags. I'll now show you the poison, but we must be very cautious how we handle it," observed the Dominie. On this he cut open the poison-bags and exhibited a small amount of pale-yellow oil-like substance. He afterwards cleaned his knife carefully, and observed, "So potent is the venom, that even should a small drop remain, and were I to cut my finger, after the lapse of many days, I might fatally poison my blood. And now, to prevent any accident, we will bury the poison-bags and fangs, where they are not likely to do any harm," he added. Having dug a hole with his axe, he did as he proposed, covering it up with leaves. "And now we will have an examination of the creature's tail, in which it differs from all other reptiles."