THE second weapon is the still more dangerous blow-gun of tropical America, called Zarabatana, or Pucunha, according to the locality. Some of these tubes measure more than eleven feet in length, and through them the arrow can be propelled with wonderful force. I have often sent an arrow to a distance of a hundred yards, and with a good aim. A native, however, can send it much farther, knack, and not mere capacity of lung, supplying the propelling power, just as it is with the pea-shooter. When the arrow is properly blown through the zarabatana a sharp “pop” ought to be heard, like the sound produced by a finger forced into a thimble and quickly withdrawn, or a cork drawn from a bottle. As to seeing the diminutive arrow in its flight, it is out of the question, and no agility can be of the least use in avoiding it. One of my friends, a peculiarly sharp-sighted officer of artillery, has often tested this point, and although there was but one arrow to watch, and it was blown in the open air, he could not see it until it either struck or passed him (of course the poisoned end was cut off). What, then, would be the result of a number of these deadly missiles hurled out of a dense bush may easily be imagined. An account of the poison with which these arrows are armed will be found on p. 64. * * * * * THE reader will please to remember that in all these cases the missile is propelled by air which is compressed by the aid of the lungs, and forced into the tube behind the bullet or arrow. Now, the AIR-GUN, which really can be made a formidable weapon, is constructed on exactly the same principle as the pea-shooter and the blow-guns, except that the air is compressed by the human arm instead of the human lungs. There are various modifications of this weapon, but in all of them air is driven into a strong chamber by means of a forcing syringe, and is released by the pull of the trigger, so as to drive out the missile which has been placed in the barrel. It is worthy of notice that the term “noiselessly destructive” weapon, as applied to the air-gun, is entirely false. I have already mentioned that with the blow-gun of tropical America a definite explosion accompanies the flight of each arrow. The same result occurs with the air-gun, the loudness of the report being in exact proportion to the force of the air, each successive report becoming slighter and the propulsive power weaker until a new supply of air is forced into the chamber. * * * * * HOWEVER dissimilar in appearance may be the cannon, rifle, pistol, or any other firearm, to the pea-shooter and its kin, the principle is exactly the same in all. It has been already mentioned that in the blow-guns the air is compressed by the exertion of human lungs, and in the air-gun the compression is achieved by human hands.