14 



MEMOIRS NATIONAL ACADEMY OF SCIENCES. 



[Vol. XIV. 



The metallic portion yielded : 



Percent. 



Iron(Fe) 91.60 



Nickel (Ni) 8. 00 



Cobalt (Co) , 49 



100. 09 

 The silicate portion yielded : 



Percent. 



SiUca (SiOj) 42. 50 



Alumina (AI2O3) 7. 90 



Iron protoxide (FeO) 19. 50 



Lime(CaO) 2.20 



Magnesia (MgO) 26. 00 



Potash (ICjO) 32 



Soda (Na20) 1 . 80 



100. 22 



Careful search was made for other elements, and in particidar, for the reasons noted, for 

 arsenic, antimony, copper, and platinum. None were found. 



In order to compare these results with those of TrottareUi, the analyses were recalculated 

 and the results given in colunon I below; in colimin II are given those of Trottarelli. I will 

 not attempt to account for the discrepancy. 



,. <■ With traces of lead, antimony, tin, lithia, sulphuric anhydride, and chlorine. 



(9) Meteoric stone, Chondrite (Cc). — Cullison, Kans. Described by Merrill.'^ Thin sections 

 showed it to be of the normal chondritic type containing olivine, enstatite, monoclinic pyroxene, 

 plagioclase feldspar, with the usual sprinkling of metal and metallic sulphides. The separation 

 of the component parts by an electromagnet and treatment with iodine resulted as foUows: 



Troilite 



Metal 



Silicate 



Schreibersite. 



The metallic portion yielded: 



Per cent. 



6. 07 



19. 40 



74. 50 



10 



100,07 



Per cent, 



SiUcon 0,129 



Sulphur Trace. 



Phosphorus 071 



9. 207 



507 



040 



160 



088 



Nickel. 



Cobalt 



Copper 



Chromium . 

 Carbon 



■> Proc. IT. S. Nat. Mus., vol. 44, 1913, pp. 325-330. 



