XXIV INTRODUCTION. 



gland at the side of the skull behind the eye. This gland is hollow, and 

 bontains the venom it secretes. Venom glands vary considerably in size 

 and position; they extend I)ack upon the neck in certain Conocercpe. Com- 

 pression by means of the muscles upon the gland forces its contents through 

 the duct and tootli. This compi-ession is entirely independent of oi)ening 

 the mouth or erecting the fangs. At the will of the seri^ent the venom 

 may or may not be delivered with the l)ite. As if the creature Avas 

 economical, and did not wish to waste its supply, it is frequently the case 

 that it strikes one or more times without using the poison, and is aljle to 

 strike a more effective blow when more thoroughly exasperated. If an 

 angi'y snake is held up by the neck, and its mouth kept open, it will raise 

 anc^lower the fangs from time to time, and occasionally spurt the venom 

 through them with considerable force. Usually on being disturbed and 

 unable to retreat, the snake throws himself into an attitude of defence by 

 coiling his body so that the upper half can be readily straightened in the 

 act of striking. A Rattlesnake will place the tail in the coil with the rattle 

 directed upward. Very angry individuals strike whether coiled or not. 

 They do not jump; the hinder part of the body remains in position, and 

 none of our serpents are in the habit of reaching more than half of their 

 length. If a stroke is successful, and the fangs enter the flesh of the victim, 

 a backward pull throws the weight of the body on the fangs, tending to 

 make free a space in front of them for the introduction of the venom. A 

 blow is sometimes given when the fangs are not erected, sometimes with 

 the mouth wide open, and sometimes, apparently, with the jaws closed, 

 the fangs passing, on the outside of the lower jaw which then serves as a 

 lever with which to disengage them. After wounding it fatally, the snake 

 watches the prey very intently until the venom has produced the desired 

 effect and the victim tjills, when it appears as if an estimate of the size was 

 made with chin and tongue by passing from one end to the other of the body 

 before the attempt to swallow begins at its nose. This intent gazing at 

 squirrels, birds, etc., in their dying agonies, has given rise to the errone- 

 ous ideas concerning fascination. All there is of fascination or charming 

 is to be accounted for by the fact just mentioned, together with the quiet, 

 almost imperceptible motion of the snake and the recklessness and terror- 

 ism of the prey. Venom hastens decomposition, and thus renders digestion 

 more rapid. 



