An Artificial Rumen System for Range Nutrition Studies

the plastic. A backing sheet is pressed in place, and the mount is trimmed to size on a paper cutter. Another sheet of adhesive plastic makes the best backing but increases t h e cost. This makes a completely waterproof and flexible mount. Acetate plastic, tracing cloth, and botany paper all make satisfactory backing material at much less cost. Self-laminating plastic is available from most stationers and office suppliers in a variety of weights and sizes. Prices vary from 40 to 75 cents per square foot. Materials for a 4 by 6 inch mount using botany paper backing costs about 12 cents.