If you happen to be one of the Iowa farmers who in recent years has had some trouble with muskrat damage in your cornfield along a creek, dredge ditch or the like and had asked Dr. Paul L. Errington of Iowa State College to come out and look over the situation to help you, the following story might be about what he would say to you Dr. Errington had in mind just such a situation when writing this story so that he might talk to you in a natural way.