Four days after this, another dog was bitten, which died in half a minute; and then another, which died in four minutes. A cat which was bitten was found dead the next day. The experiments having been discontinued some time, from want of subjects, a common black-snake was procured, which was healthy and vigorous, and about three feet long. It was brought to the rattlesnake, when they bit each other, the black-snake biting the rattlesnake so as to make it bleed. They were then separated, and in less than eight minutes the black-snake died, while the rattlesnake, on the contrary, showed no signs of indisposition, appearing as well as before. Lastly, in order to try whether the rattlesnake could poison itself, it was provoked to bite itself: the experiment succeeded, and the animal expired in less than twelve hours."--Rees's _Cyclopædia_, art. Crotalus. Charlevoix says that "La morsure du Serpent à Sonnettes est mortelle, si on n'y rémédie sur-le-champ; mais la Providence y a pourvu. Dans tous les endroits, où se rencontre ce dangereux reptile, il croît une plante à laquelle on a donné le nom d'Herbe à Serpent à Sonnettes (Bidens Canadensis) et dont la racine est un antidote sûr contre le venin de cet animal.... Il est rare que le serpent à sonnettes attaque les passans qui ne lui cherchent point nuire. J'eu ai en un à mes pieds qui eut assurément plus de peur que moi, car je ne l'aperçus que quand il fuyoit."--Charlevoix, vol. v., p. 235. "Archdeacon Burnaby was told by a planter in Virginia that he had one day provoked a rattlesnake to such a degree as to make it strike a small vine which grew close by, and the vine presently drooped and died."--Burnaby's _Travels in North America_, in Pinkerton, vol. xiii., p. 724.