This issue's cover: Drip torch ignition of slashed biomass near Chamela, Mexico. This site has been used to examine the immediate and long-term effects of slash-and-burn agriculture on the biochemistry of tropical dry forest, perhaps the most endangered forest type in the tropics. See C.P. Giardina et al., "Changes in soil phosphorous and nitrogen during slash-and-burn clearing of a dry tropical forest," p. 399-405. Photo: Robert Sanford, Jr., Univ. of Denver.