He could watch there until the sheep should pass through, and then he could come out and drive them on." AGENTS OF DESTRUCTION. The settling up of much of their former range, with pursuit by skin-hunters, head-hunters, and meat-hunters, has had much to do with the reduction in numbers of the mountain sheep, but more important than these have been the ravages by diseases brought in to their range by the domestic sheep, and then spread by the wild species among their wild associates. For many years it has been known that the wild sheep of certain portions of the Rocky Mountain region are afflicted with scab, a disease which in recent years seems to have attacked the elk as well. Testimony is abundant that wild sheep are killed by scab as domestic sheep are. On a few occasions I have seen animals that appeared to have died from this cause, but Mr. Hofer, to be quoted later, has had a much broader experience. More sweeping and even more fatal has been the introduction among the wild sheep of an anthrax, of which, however, very little is known. Aside from man, the most important enemies of the sheep in nature are the mountain lion and eagles of two species. These last I believe to be so destructive to newly born sheep and goats that I think it a duty to kill them whenever possible. Dr. Edward L. Munson, at that time Assistant Surgeon, U.S. Army, but whose services in more recent years have won him so much credit, and such well deserved promotion, wrote me in 1897 the following interesting paragraphs with relation to disease among sheep. He said: "The Bear Paw Mountains were full of mountain sheep a dozen years ago. One was roped last summer, and this is the only representative which has been seen or heard of there in ten years. The introduction of tame sheep early in the '80's was followed by a most destructive anthrax, which not only destroyed immense numbers of tame sheep, but also exterminated the wild ones, which appeared to be especially susceptible to this disease. In going through these mountains one often finds the skeletons of a number huddled together, and the above is the explanation given by some of the older settlers. The mountains are small, and the wild sheep could not climb up out of the infected zone. Immediate contact is, of course, not necessary in the propagation of anthrax, and the bacilli and spores left on soil grazed over by an infected band would readily infect another animal feeding over such a country even a long time afterward. "I have also heard that the introduction of dog distemper played havoc with wolves, coyotes, and Indian dogs, when it first came into the country. This is the case with regard to any disease introduced into a virgin human population, in which there is no immunity due to the prevalence of such a disease for hundreds of years previously." Mr. Elwood Hofer, discussing this subject in conversation, says: