This study has defined actual reductions in recoverable merchantable volumes per acre in fire-killed pine stands. It has demonstrated that, when more than two years have elapsed, reductions in yield of considerable magnitude due to deterioration as a direct or indirect result of fire occur in jack pine and red pine stands. The approximate percentages of the merchantable, recoverable volume of jack pine and red pine stands in this region affected by sap stain, at different intervals following the fire, have also been determined. Information concerning the reduction in value of salvaged wood has been presented in a mimeographed report of the Forest Insect Laboratory, Sault Ste. Marie (11), and other reports covering various aspects of entomological deterioration are expected. These reports in combination with this paper will complete the comprehensive picture of deterioration in fire-killed jack, red, and white pine.