The New International Encyclopædia…
“ The poison apparatus, fangs (which are of the proteroglyphic type) , and the manner and result of biting, are treated of under Snake. Here it needs only be said that, like the vipers generally, these snakes are sluggish and loth to bite when it can be avoided, or when they are not surprised into a sudden stroke. This disposition varies, however, with the weather, their hunger, the season (all are irritable when sloughing their skin) , and it differs in various species. Even the smallest may cause a man serious illness and perhaps death if it succeeds in introducing much poison into a wound ”
