Nature's Teachings: Human Invention Anticipated by Nature. J. G. Wood

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СКАЧАТЬ now come to the Vegetable Poisons, the two best known of which are the Upas poison of Borneo, and the Wourali of South America. It is rather remarkable that in both these cases the arrows are very small, and are blown through a hollow tube, after the manner of the well-known “Puff-and-dart” toy of the present day.

      The Upas poison is simply the juice of the tree, and it does not retain its strength for more than a few hours after it has been placed on the arrow-points. A supply of the same liquid is therefore kept in an air-tight vessel made of bamboo, the opening being closed by a large lump of wax kneaded over it at the mouth. One of these little flasks, taken from a specimen in my collection, is seen on the extreme right of the illustration.

      The Wourali poison owes all its power to its vegetable element, though certain animal substances are generally mixed with it. The principal ingredient is the juice of one of the strychnine vines, which is extracted by boiling, and then carefully inspissated until it is about the consistency of treacle. This poison differs from the Upas in the fact that it retains its potency after very many years, if only kept dry. I have a number of arrows poisoned with the Wourali. They were given to me by the late Mr. Waterton, who procured them in 1812, and even in the present year (1875) they are as deadly as when they were first made.

      A bundle of these tiny arrows, surmounted by the little wheel which is used to guard the hand from being pricked, is seen next to the Bornean poison-flask.

       SERPENT-FANG. BEE-STING. SCORPION-STING. NETTLE-STING. SPIDER-FANG. INJECTING SYRINGE. POISONED ARROWS AND POISON-FLASK.

      Beside these little arrows, which are only about ten inches in length, very much larger arrows are used both for war and hunting, and are propelled by the bow, and not with the breath. Many of these arrows are nearly six feet in length. In all, the head is movable fitting quite loosely into a socket, so that when an animal is struck and springs forward, the shaft is shaken off, to be picked up by the hunter, and fitted with another point, while the poisoned head remains in the wound.

      Another kind of poison, also of a vegetable origin, is used by the Fan tribe. The arrows are mere little slips of bamboo, and are propelled by a slight crossbow. But the poison is so potent, that even these tiny weapons produce a fatal effect.

      Nearly in the centre of the illustration is seen a rather curiously formed syringe, with an extremely long and slender tip. This is a recently invented instrument, used for the purpose of subcutaneous injection—i.e. of injecting any liquid under the skin. It is mostly employed for injecting opium and other drugs of similar qualities, for the purpose of obtaining relief from local pain. The slender spike-like point is hollow, and ends in a sharp tip, formed like the head of a lance. Just below the head there is a little hole, communicating with the interior of the tube.

      The mode of operating is simple enough. The syringe is filled with the drug, and the point introduced under the skin at any given spot. Pressure on the piston then forces out the liquid, and causes it to mix with the blood.

Natural Animal Poisons.

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      Now, both in the animal and vegetable worlds may be found several examples of an apparatus which acts in exactly the same manner.

      The first is the poison-fang of the Serpent, a specimen of which is given on the left hand of the illustration. This fang answers in every respect to the syringe above mentioned. The long and slender fang is hollow, and answers to the pipe of the syringe. It communicates at the base with a reservoir of liquid poison, which answers to the body of the syringe, and there is a little hole, or rather slit, just above the point, which allows the poison to escape.

      When the serpent makes its stroke, the base of the fang is driven against the reservoir, so that the liquid is urged through the hollow tube, and forced into the wound. Even in large serpents these fangs are very small. I have now before me some fangs of the cobra, puff-adder, rattlesnake, and viper, and it is astonishing how small and slender are these most deadly weapons. The figure in the illustration is much magnified, in order to show the aperture at the base, where communication is made with the interior of the fang. As the exit hole is on the upper curve of the fang, it is not visible in the figure.

      Next to the serpent’s fang is a representation of the Bee-sting, the poisonous reservoir being seen at the base, and having attached to it the tiny thread-like gland by which the poison is secreted.

      In the centre is seen the tail of a Scorpion, with its hooked sting. The last joint is formed just like the serpent’s fang, being hollow, having a sharp point with a slit near the end, and a poison reservoir in the rounded base. When the scorpion attacks an enemy, it strikes violently with the tail, and the force of the blow drives out the poison just as is done with the serpent’s fang.

      At the bottom of the illustration is shown the poison-fang of a Spider, which, as the reader may see, is formed just on the principle of the scorpion-sting.

Natural Vegetable Poisons.

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      So much for animal poisons. We will now pass to the vegetable world.

      Of the vegetable sting-bearers none are more familiar to us than the Nettle, three species of which inhabit this country. The two commonest are the Great Nettle (Urtica diœcea) and the Small Nettle (Urtica urens), and both of them are armed with venomous stings, which cause the plants to be so much dreaded.

      The structure of these stings is very simple, and can be made out with an ordinary microscope, or even a good pocket lens. Each of these stings is, in fact, a rather elaborately constructed hair, hollow throughout its length, coming to a point at the tip, and having the base swollen into a receptacle containing the poisonous juice. When any object—such, for example, as the human hand—touches a nettle, the points of the stings slightly penetrate the skin, and the hair is pressed downwards against the base, so that the poison is forced through the hole.

      One of these hairs is shown in the left-hand bottom corner of the illustration.

      Even the tiny stings of our English nettles are sufficiently venomous to cause considerable pain, and, in some cases, even to affect the whole nervous system. But some of the exotic nettles are infinitely more formidable, and are, indeed, so dangerous that, when they are grown in a botanical garden, a fence is placed round them, so as to prevent visitors even from touching a single leaf.

      The two most dreaded species are called Urtica heterophylla and Urtica crenulata. The former is thought to be the more dangerous of the two, and a good idea of its venomous qualities may be gathered from an account of an adventure with Urtica crenulata. The narrator is M. L. de la Tour.

      “One of the leaves slightly touched the first three fingers of my left hand; at the time I only perceived a slight pricking, to which I paid no attention. This was at seven in the morning. The pain continued to increase, and in an hour it became intolerable; it seemed as if some one were rubbing my fingers with a hot iron. Nevertheless, there was no remarkable appearance, neither swelling, nor pustules, nor inflammation.

      “The pain spread rapidly along the arm as far as the armpit. I was then seized with СКАЧАТЬ