COLLKCl lo.NS IN KCON'OMIC (JKOI-OCJV A M » MK rAM.rKCY. 237 



since 18(J(>. :iii*l its (»cciiirrin'r is very lull\ illustrated hy a larpi* colloc- 

 tioii i»n'par»'(l l»v riol. S. I'. IN-cUhaiii in coiiiirftioii with a rcptirt for 

 tilt' Ti'iith (.'«'iisns. A cop.v "< t'''-"^ ivport will hv loiiiid on tlie taliU* in 

 tlic exliibitioii ball and slionld l>o consnltcd in connection with the 

 spt'cinu'iis. 'I'his colU'ction is, in schhc cases, supitlemcntcd by speci- 

 in«'ns from otlu'r sonrces. 



The Tenth (Nmisus collection was orij^inally airan;ied and tr«'ated 

 upon a jieoj^rapical basis, hut tor Museum purposes stneral series have 

 been selectetl tVorn the •^eo^raphittal series to illustrati' certain points. 



The first series is arraujred to show gradually decreasinj; specific 

 gravity. Tiie seri«*s begins with a very dark oil of 22^ Baunie = 0.!)L'l() 

 sptH'ifii; gravity. In general as the specilic gravity decreases the color 

 grows lighter. To this, however, there are several notable ex(H'ptions. 

 For instance, Xo. 5!>7."5<» {'.V2° Baunie=0.8041 s[)ecific, gravity) is much 

 lighter than its associates. The same is also true of No. 597.3.^ (i'P 

 Bauine=(».8(»0() specific gravity) and No. oDTI.'i (47"^ BannH'=() 7900 

 specific gravity). On the other hand No. 59500 {-iS^ Baun>e=(t.78G5 

 specific gravity) and 5','.")91 (48^*^ Baume=0.7854 specific gravity) are 

 darker than their associates, wlijle the color of No. 59.584, with the very 

 low gravity of 50ii^ Bannie=0.7755 specific gravity, is as dark as any 

 member of the series. 



The best and almost the only way to get an idea of the sjjecific 

 gravity of the specimens, short of making a direct determination, is to 

 tip the bottle on the side and observe the rate at which the film, that is 

 formed on the glass when the bottle is returned to the perpentlicular, 

 llows back. In this respect the series shows a gra<lual change. The 

 heavy oils take some time to flow back, while the lightest flows back 

 almost instantly. 



(1) 2"i Biuniif— O.y-ilOsperitic f;r;ivity, <liirk greeiiisli. Colorado. (5'J741.) 



(2) 2:}^^ B;iuni(^ = 0.'J12(( specific sr^vity, black. From the Trenton limestone. 

 .J. W. Mitchell Well. Plum Lick Creek, neiir Middletown, Honrhon Connty, Ken- 

 tucky. (oO.'iOJ.) 



(;{) '21 Hamnc _ O.f^Ol" specific jiiavity, black. From the millstone j;rit (Carbon- 

 iferous). LeiM Heck Well, near N'oicauo, Wood County, West Virginia. (.'il>."»."):{. ) 



(4) 28i Baume = ii.H8:{3 ."(•ecilic gravity, bl.ick. Fnun the millstone grit (Carbon- 

 iferous), near Volcano, Wood (!ounty, West \'iiginia. (r»9r>.'),'i.^ 



(5) 2ir Baum<5 =0.HJ;Or> specilic gravity, black. l?rockiii Well, .lohnson County, 

 Kentucky. (.".'J.')07. ) 



(6) :«• Baum^ - O.HT.'iO sjiecilic gravity, black. From the millston.' grit i Carbon- 

 iferous), near ^'olcano, Wood County, West Virgiui.i. (.V.t.'iiiT.) 



(7) :nf Baum*'- =0.8r>6y specific gravity, dark greenish. Broward Wtll. ,?(>liu.son 

 County, Kentucky. (fjDiVJH.) 



(8) ;t*2f-' Baumd = 0.8<)14 Bpecitic gravity, dark greenish re<l. (;reen.sl)urgh. West- 

 moreland Connty, Pennsylvania. (.')97;M5. ) 



(9) 'Xl Baum^' = 0.8'»HM specific gravity, black. I'rom the Trenton limestone. 

 Taskin Well, near North Baltimore, Wood County, Ohio. ( olJoWJ. ) 



(10) :t4 Baume= 0.8r>:i6 specific gravity, black. Oil in sand, here 2:i feet in thick- 

 ness; depth of well r>.'(l feet; «lrilled l'*77 ; torpedor-d ; yielded 3 barrels of ml itn 

 lirst day of flow. Lot 4f*23, Howe, Forest County, Pennsylvania. (;V.I-(».'». ) 



