Cover: Shoot-tips of 300-day-old Monterey pine seedlings developing on Kraft pulp mill solid residues. Left, control (seedlings growing in 100% clay soil); Right, seedlings growing in 100% fly ashes. The thinner shoot-tip belongs to a seedling growing in clay soil; the other tip with larger cells was grown in presence of 100% fly ash. See Jordan et al., "Kraft Mill Residues Effects on Monterey Pine Growth and Soil Microbial Activity," p. 1004-1009. Photos by Miguel Jordan.