THE BOILING SPRINGS. 27 form a thick cloud, and shut out the light of the sun. People get badly scalded, once in a while, when they are walking around, among these holes in the earth. Some- times the holes which are sending up nothing but vapor, will suddenly let a stream of water fly from their throats ; and then woe be to the man who is any where near them, unless he instantly makes his escape! The cause of the boiling of these geysers is no doubt the volcanic fire in the bowels of the earth in that vi- cinity. The crust of the earth there is