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Show [ 174 ] 98 LILIACE.<t~. . . (S' ) Lnrnmie rivet. July 14· '> Yucca angustifolw, tms. fJ . th ·w ind ri,·cr mountains. Aug. 1 ... -17. Alli.um reticulatum, (FroA.) De tics mL e . . to the Red Butt.c.,o;. Aug. 26-31 &nd. aa.n a slel la la, (De f.) From tho anumc nvrr MELI\~THACE .'E_' Zigadenus glattCI.IS, (N utt.) weet Water river. Aug. JUNCACE/E. .Juncus echinalus, (Muhl.) North fork of the Platte. :-;cpt. 4· COMMBLYl\ A<'E:'I.~. TtadeiclUitia Vir~inica, (Linn.,) atHI a narrow-lca'"cd variety. Kansa and Plntte. CY J-'E R.\. 'E _}~ . C arex Jr .c sl ucac ea , (:': -lcbk · ) Ou the Kansas. June. J 0 22 ) L ' ll1c tllue river of tho Kansas. u n . c. Cl.urea, (Nutl. I . . w· d .. ,('T tnountuins, ncar perpetual snow. C. panicea, (Linn.) Alpine rrgwn o1_ the tn tt C. atrata, (1inn.) Wieh the ptccdhng. ~purtina C!J1lV3U""roit/('8, (W t. l 1(1 . ) 1· •· ttlu, l..lluf' rive. r Llf the 1{nnso.s. .I nne 2~· A~otida pal/ens) ('Pur,.;h.) On tho l>tallc. June Z9. J 23 Ag'"r"o sti.s llfichauxi(J'TI.a, (Trill.) Little B lur t·w N o_f the .1 1Ul.S,'\. ."' • .u n,o A· 13-14. PkleumaIp t.n ttm, (J.m. n.;~ ·< \l~r'~ i-ne rt'!Jion of the Wmd n\'Cf mounlam.... ug. Brorous eiii.alus (Linn. y On the Platte. J un.e-A ug. . Putuca om.n a, ('I. .. m. n. ) AlIl l'nc TC,"..,' ion of llw Wind il\ Ct' mountam.'\. Au~. 13-\ 4 . Fuluca nutans, ( Willd.) On the Kansa.'>. Poa kJ:Xa, (l'fM'n!w.) \V'ith tJtc prcc<Xfing. ] • . cr~A~~.a; , (Ml'-v1u.. x. . ) With th<·· 1~-oo.·din~. :-\ptliclet:-l :2~0owercJ. Aug. 16, P. nervata, (Willd.) On th KtutHa.s. th.c Platt~ as high as La1amie f ..KiJeleria crislaia, ( Pr•r:-;. ) Big mue rivN of the l{ nn"as, OJl(l on river. June 20-July ~2 . . . · Aug. 13-14. DOOw.mpsia W'Apitosa, ( Uw.uv.) Alpioo region of th WmJ nvcr mountrun.<;. Andropogon swparws, (Michx. ) Lower Platte. A. muans, (Linn.) LaJ'tlmie rher, North fork of the 111attc. Sept. 3-4. Hordeumjubatum, ( Ait. ) Forks of the Pratte. July 2. Elymus Virgim'cus, (Linn.) Dig Blue river of the Kansas. Juno 20. E. Canadensis, (Linn.) Little Dluc ri,·er of the Kansas, Juno 22. Beckmannia crucifrmnis, (.Tac(\·) North fork of the Platte. .T uly 22. BQUI E'I'ACEJE. Equisetum arvense, (Linn.) On a lake in th<' Wind river mouut ains. FfUCE,'. Aug. 12-17. Hypopeltis oblusa, ('!'orr. ('ompeml. Bot. .N. •. tate~, P· .3 80, 18·2 6·. ) ·\ 8.P 1'd i_ urn ob~tu sum, (bWt islludm.) vVoo<lsia Pcrrininna, (Hook. and Grev. Icon. Fil. I. t. fiS.) Physcmatmm (haulf.) 0 u ' (Hook. Fl. Bor. Am. iJ, p. 25!).) On the Platt~· . 99 [ 174 ] A 'TROKO.l.\1lCAL OBSERV1\TION . The maps which accompany this report are on Flarnsteecl's lHodificd projection, aml tbc longitudes arc referred to the mur'idian of Green wiclt. · For the determiuation of astronomical positions, wr were provided wid· the follow~ng in trumcnts: One telesco pe, nwgnifyiuo- power 120. One circle, by Garnbey, Paris. One sextant, by G<lmbey, P aris. One scxtaut, by Troughtou. Ooe box chrou omcter No. 7,SlOJ by French. One BrockbatJk pocket cbrouomcter. One smaU watch with n. light chronometer balance, ~o . 4,632, by Arnold & D<'llt. The rate of the rl lrOJ ll) l1lctrr 7 10, i · c.xhib itc.d in the followin~ ·tal ement: ·'NEw Yo 1u~, lllu!J 5 18·12 " Chronomcwr No. 7,81 0 , by F rench, JS this day at 1100!1- " Stow of G reeuwich mean time 11' J" "Past of New York mea11 time 4/i. •l5 ' 1" "Lo~cs pur day .2' ' 11~ ·• AHTHU l{ STEW.t\H'l ': u 74 llfl-'l'Ciwllts' 8.-L·c/wnge." An accident atHOJJg ::;ouJ~ rougl1 •rrottlld in the llcJgLborfiOo<lof til· Kan-as river , trained the lnt.lunce of th is ch ronometer, (No. 7,0 10,) a11d r •nucrcd it uscle, durmg the remainder or the campai!Sll. FrOJll llle .IIlii ol June to the 2<JLh of .\ ug11:t, Htcln-£ivc ly, the lono·ituue~ dep ·nd upon the Brockbank pockrt chroJJometer; the rate nf wllich, 011 leaviwr St. Louis. was fourt een cconu~. The rate ol.>tai11cd hy observations at Fort Laramie. 14".05, has b 'eu used in calcnla tio!l . From the :"Htll nf .. \ ugust unti l tlte tcrmmauon of t }w journey, No. 4,G32 (of which the rate was 35".7D) was used for tho ·anw pnrroscs. T he rate of this watcl1 W <ts irregula r, a 11d l place but little confidence in the few 1ongitnJcs whic:ll drpc11d 11pon it, though, so far as we have n.ny means nt juclo-ing, they appear· tole rably correct. |
