Pearson 1971 Sun Oct. 10 5 a.m. foggy, but sun up by 6 and fog disappearing, including a curious almost-colorless rainbow. Hairs soaked while running trails and Tillandsia wet on north side but not south. Very light freeze from north (Tarata), minimum temp. 36°. Our desert clear by 6:30, but still overcast + foggy a mile toward Tarata, and Tarata still completely overcast at 8:30 a.m. Curious acoustic effects; can hear (and a native could understand) a loudspeaker in Tarata. Camp is a little further north of the 10 km marker on the Tarata-Tarata road (about 10½ km). No Tillandsia is budding or flowering, nor seedlings, but it looks healthy. The dense and crescents extend east-west going toward the south; there are more of the little pink-red succulent on the area proper, nor the rusty-brillo babas, but some grow 100 yds north of the area. There is one 2-foot-high hard "cactus" within the area; it has choked and killed numerous Tillandsia's; others can't try to keep from being smothered. Trails noted, except a few dry undercuts of them (unspurring), 2 dead trails laden with mouse carcasses noted. Brief flash- quartz crystals sparkle lighting revealed no geodes or potter; too much glitter in soil to count spider-eyes. Saw small bird and lizard-gallo trips in the gully next of camp. at 10 a.m. put about 25 museum specimens in this gully. at 5 p.m. a Trepadorum? was in one of the trails. Changed the two soft trails. In a typical part of the grid, I marked off a 15 x 15 m section and measured and turned over all the Tillandsia's. There were 5-7 mats or rows and recorded in total under them 16 tiny spiders, 3 medium-small spiders, 1 long-legged micro-