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Show 321 [ 174 } ASTRONOMICAL OH. ERVATION • '!'he map which acrompo.nicl' this n•porl i:-1 construeh'u 11pou Flumstr 1l'fl modified prOJC'C'twn, on a scnle of 1 : 2,000,000, and b a ~cd Hpoa lht> aslronotnind ohHI'rvutiott~-< made clurinv tlw cam-igns of 1842 n d 1843-'ll'l. 'l'lw lon~i tndl'l'l nt •' n•f,·w•d to the nH•ridian of C:n l'tnvich1 uud dl'· ~nd upon eighteen principal shtliotw; fnm of whiC'h un' dl'll'rmi tu·d by Ol'<'ultntiouf' of Ji \('d stars, nnd the rcmuitting fou rll'l'll by (.'dip,.; s of IIH· sattlltlt•s of .Jupth•r. ~\11 tht· lt>r,gitl!df's ou the mup havo l>et':l <'hrouomctricully n •frt n·d to lht·sf' pmo~itions. In tl I' couniO of the last CAplomtion, it hrcanH.' C\irkllt tlwt tltr• longitud.·s t':..tnhli:-;\H•tl clnrin15 thecampuign of 181~ WNt) Cl)llt·rti wly lhrowu too Ctr to 'tl11· WI'Slw:trd, hj lht• ,,,.,.,tltali 111 of 1,1l ArictiH, to which they had h ('II rl'frt 1"('11 hy tltt• c·h rollOJnC'h·r. 'fbi~ o<'l'llltution toul, plar1' nl tho bright Jimli of the moon, whic·h C'< JH'ril' llt'l' ha-; rcr ntly ~-ohown to lw dco, I'T\ ill!!; oJ littl1· rorn-· pnrativc conftd!'llC<'. 'J'l1i~ poFoit iou IJ.t~-o t 111•n fon hi'!' II nb:uHimu 1l, and Uw l,lllc,itwln· d,•Jwndi11g upon it hn'c hci'U rd(•m d <'hrmwnaetric:,lly to thoi'P c·,.,t.thli~-ohcd iu I R1 :l und 181l. 'l'h• ('OtWlt of the <'HAtting cxpcditiou will int t•r.-;cc·t th!• li111' ,•,.tabh:-.lwd h: our pn'VJIIII" op!·ration;;;, at 'ariou• point.~, which it iH propo~-ord to rot-rc·d iu loll•; ttudl' h.\ htuar clllll•irmtinnr;, a11d ~-ouclt ut!t1·• al>:;ulull• ob,crvutions no; uwy h • conv<'uicntly obtaitll!tl. • 'uc!t a )Hlhtlion at the uwuth of t!u ! ' o11l.titH' quibouit, on tho Arknni'U~ river, will he :1 J!OO<l poittt of r1 fcn•tH'tl for tla• lon!!ill•de~-o along tit• Ji,ot ot the mouul.tins. Iu pm;sin g- hy tlu• IJtah, to tiH :-;outhf'rn pmti•m of the Un'at H.dt h);,•, "' shall have nn opportuaity to Ycri(y our lmu~itmll's in that qu<trh·r; and :H; til the ''otrr:·H; of om <' plnwtio, wr shulltouch upon s 'vcral point~ Jl'''viuuHI_v <ld<'rtllinnl alon~ flu \\1'..,(1'111 Jirwt of 1111r n·c<·llt journty, WI' Hlta ll prohahly lw ahk to form u n·u~ou ahly com•rt lranw "'' wlti,·h I> has<' tlu l'oll ~ slrucliou of a gcncrnlwnp oftlw <'Olltlfry. lt1 that now ptP~~·ntPd, v;, h:1w c:m•ful'v :nnrrJ,,d to lay dtlWil nny thing n!l crrtai11 whir l1 muy 11ot he l~•ulld in tho lil'!<l houl<s ol ou1 l'lllnt·~ ... , \'vl1id1 w<·ro grt-all_y fucilitult:J by till' dtamcll'r of tht• <"ountry in wlu<'h W''' 4'n' "!Nat it>••. 'fo the kindll('H!l of Cnptaill \Vill,t•.. ; r .un inddllt>d for thC' longitudt•s of ~"•)fl \ 'Uil!'OU\"t'r nnll Nuevo Helvetia, whirl! WNC' f11111ishf'tl to mo bt•fim~ the publicat ion of his mup. Our n ·con-noissancll ill contH~l' kll w11h hi!' >ilH \'t') '"' b) tho:c· positionH. 'l'h1• CO:l!!llin(' of tlH' Puc·i !ir to; lu id down ,,c, ord in~ to I hl' sun C'j of V nne om er , and tltr· b·ty of San t'rnncisco is rCUUC''U from tlw ropy (\f n lll:lllllSCript mup of a ucllul d Hllr\ ), in the poq~l('S~<itll\ of Mr. Butter. I J. C. FHLMON'J' • .21 I• |