JESimpson,1938 850ft.,PasoMcDougal, Pinacate Region, Sonora March 25,1938,continued with a scattering of quartz but no lava. Sparse vegetation of creosote,cholla,palo verde,some soft succulents,and other cacti grows on the east face of Sierra Hornaday. On the desert floor of the tan sand in the near vicinity grows much creosote, cholla,ironwood,a bunch-grass (quite densely),and some saquero and ochotillo. Mr. Lenon told us the trick of telling time by the North Star and Big Dipper with an arithmatic formula;the method seems to work fairly well: using an imaginary line from the North Star thru the two "tip-stars" of the Big Dipper as the "hour-hand"(with a vertical line from horizon thru North Star as a line thru ne.12 and ne 6 of a clock-face) ascertain the hour figure to the quarter-hour; add to that figure,one; double the sum; add the number of month from the first of the year to the quarter month (eg,to-day,March 25th would be 23/4); subtract this from 161/4 (if the number be larger than 161/4;subtract from 401/4 [NB: 161/4+24=401/4]) This method sounded comical and cumbersome,but it has held up under investigation so far. After putting up our specimens we broke camp to start for Crater Elegante with Mr. Lenon to go ahead by fifteen minutes or so to show the way. He got only a few yards from camp and pushed