Records of lumber prices for important woods are compiled quarterly. These figures are useful in establishing timber sale prices on the National Forests. Statistics as to the annual consumption of lumber in the country are also compiled by this office. The wood waste exchange was established in 1914 by the Forest Service. It consists of two lists of manufacturers, which are sent out quarterly to persons desiring them. One of these is of "Opportunities to Sell Waste" and contains the names of firms which use sawdust and small pieces of wood. This list is sent to people having waste for sale. The other list is of "Opportunities to Buy Waste," and gives the names of concerns which have waste to dispose of. This list is sent to people who wish to buy material. No charge is made for this service, and at the present time over 500 coöperators are using this exchange. By the use of this exchange, makers of wooden novelties have been successful in finding supplies of material near their plants. Other wood-working industries have been able to dispose of their waste at higher prices than they could otherwise have obtained. Many firms were located within short distances of each other, but until recently have had no way of getting together. A Philadelphia firm, engaged in the manufacture of composition flooring, has been able to obtain a portion of its sawdust from a New York lumber company. A New York woodworking establishment disposed of its waste pieces of white oak and sugar maple to a maker of wooden novelties in Connecticut for use in the manufacture of furniture knobs. A clock maker of Connecticut secured waste material for making clock boxes from the planing mill of a New York lumber company. CHAPTER III THE PROTECTION OF THE NATIONAL FORESTS The resources of the National Forests may be injured or destroyed in many ways. Fire may burn the timber and young growth; insects and tree diseases may damage or kill timber, and certain persons may innocently or willfully commit trespass on National Forest land and use the resources without permit. Then also, the fish and game of the Forests must be protected from unlawful shooting and trapping, and the water issuing from National Forest streams must be kept free from pollution, to protect the public health. PROTECTION FROM FIRE