When we study the operation of our State laws on the ground we find that for various reasons they are not fully effective. A steady and in some cases rapid diminution of animals is going on so far as I have observed in Colorado and Wyoming; either the wardens strictly enforce the laws with strangers and wink at the breaking of them by residents, or they draw their salaries and do not enforce the laws at all.[9] [Footnote 9: Addendum.--There is no question as to the good intention of State legislation. The chief difficulty in the enforcement of the law is that officers appointed locally, and partly from political reasons, shrink from applying the penalties of the law to their own friends and neighbors, especially where the animals are apparently abundant and are sought for food. The honest enforcement of the law renders the officer unpopular, even if it does not expose him to personal danger. He is regarded as interfering with long established rights and customs. The above applies to conscientious officers. Many local game wardens, as in the Colorado White River Plateau, for example, give absolutely no attention to their duties, and are not even on the ground at the opening of the season. In the Plateau in August, 1901, the laws were being openly and flagrantly violated, not only by visitors, but by residents. At the same time the National forest laws were being most strictly and intelligently enforced. There is no question whatever that the people of various States can be brought to understand that National aid or co-operation in the protection of certain wild areas is as advantageous to a locality as National irrigation and National forest protection. It is to be sought as a boon and not as an infringement.] THE VARIOUS CAUSES OF ELIMINATION.