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Show L. J I ,, Ex. Doc. No. 41. G3 how vrr to thr sott1h of this. Under thi . date, in th cata logue of p htn ts , ·'i I l be fou 11 d many d il.rni ~ g .r~·om. th O~-i(' h cr •lofo re o bs{' rv~·d; amonrr~L them the zansrhncna C aldonuc~1, al~o n n< w shrub w1th an edhi ble nul, a grass ;·1 1I ted tot 1H ' g rarn a, JA\ lI am ' s ucct II e, arlcml.S.l a cnnn, aud many vnri •tie ._ of Jll('zquitc . . . () c 1 o be r 2 2. -T h c lt ow t1 z c r s c" llH' \1 p ;11 > o u l Ill n e o' c] o c k, h ann g, in the previous d;1y's work, th <• ir shafts broken, nnd, indeed, cv •rytlltn cr that was p ossible to br<:ak about them. \Ve :1gain lcfl the ri r e~ to avoid a cafion, which I <''.:amin ed in s ·ver;tl plnces, nntl saw no o h ~·d n <.;] r s t o a good road . 'J' h c · Cl ii on was form e d h y a . car tl of basalt, overlaying limestone nnd sand-stone in regular strata. Through these the riYer ·ul· its way. l\1any de<·p arroyo::; haYe paid tribute to tbe Gila, but in non have we yet found water. Following the bed of one of t hes ·, to <'xamine thee ·c·cntric geological formation it display<'d, 1 found unkn own cbarn.ctcr · written on a ro ck, co pic · of which were made, hut their a ntic1uity is que tionaolc . \Vc were now fasl approaching 1hr ground when• rumor and the, map· of the day place the ruins of th so cal l •d Azt ·e towns. T his g-ave th ' charac ters alluded to aclditiona) interest; th y w •r • indente( l on a calcareous santlslone ro ck, c hr ome <'Olore cl on the out- 8i d(· , pr s<·nt ing a pr rf •c· tly white fra<.:ture. 'l'bi~ mad' th m very . conspicuo us, and ensily sel'n from a di:·dance. The co loring mat-t e r o f t h e e ' t c r n a ] fa c e o f t h e r o c k m a y p r o c c <' t l fro m w a t c r, a s th er was above the characters a distinct w:1ter liJl<', ;1nd C\ cry nppcaranec that tl1 is gorge had more than once been the Sl'<'llC of O \ erilows and devastation. W. e en('amped on a bluff ltirrh above the riv •r, in vi ew or a rod, ~ wlllch. we narncd, from it s gc·n pral appe:nancr, Stt•('ple ro('k. Latitud<' of our camp to night, by 17 cir<'um-m(·ridian altitudes of beta aquari i, :32° :3 '' 1:3" . Longrt ud e HHP 07' :30" . 0 c I o lH' r 2 3. - L ast 11 i g h l . t h <' 1 U.' ave n s be cam r o v <' r r n s t , t b r a i r damp, and \VC <'XlH'd<•d for the first tinw ~inct' Jc•aving- S,1nta [i'(·, (a month to morrow,) to have a .'prink!<· o(' tain; but, at 9 tb i: motning, tht• C'lo uds h:1d all lH•en ('ha:-.vd away, nnd tht· sun C'ill't'<'red up in undisputed pos. rs:-.ion of all aboY(' til<' horizon. 'I'ltc atm osphere n •sume<l its dryn ess and clasticit , and at night the stars looked bright<·r, and the dvpth of the si>a 'C.' between great r, than C'Y<' r. The thnne;rs of tc·i 1 l• · r ' ;nr• \ (•ry rrrc·:-11, O\\ incr tn 1liL' di~·dnnce • ..., ("> from the inllucnr of larg<> lllilS.'<s of w;t!C'r, "''d, if thc·y were ac-companied by corn•sponding- (' han g ('$ in l1umidity, th<·y would be in , up p o r t a b I ' . L n s t n i g lJ t w c w c 11 t t o I> r d '" i t h t h (' t h <> n n o m C' t e r a t 70° L1 'ahrcnheit, and awal·cned th is mnrning shin·ring, the thermo m d c r mark i n g 2!P · yet , 11 o t w i t h s I and in g, our b I a 11 k et s w c r e as Jry as tltough \>\"C !J nd slt•pf in a JtOil"C . The table land, J .j() fL·d nbon.! the.• rin~ r th i c.: k with Lug ' paY i n g p ebb I e-;, a::; to w , k c i L wa~ ron red so smooth place to lie upon. diflil'ult to get a. The growth of to-dily and ) t'ster<lay, 011 t} l(' hill~ nnd in tl1P Yall? ys, very lllU<'h resembles that on the Dl·l .N ortr, the only t' ·ce p-tL on s b e i n g a fe w n c w au d u e a u t iJ ul y a r i e t i c.· s of t h c r a c t u s • Aft c r ' 1 l ' c n g d ,_ LS r• e s' 1' I' rc ele to |