514 G. P. Merrill — Minor Constituents of Meteorites. 



I II 



Iron oxides _ 2*520$ 



Iron protochloride . 0-097 



Iron _ 89-167 93*425$ 



100-047 99-96 



In process of analysis schreibersite to the amount of 1*832 

 per cent was separated out. This has the following composi- 

 tion : 



Iron.. 55*04$ 



Nickel. _ 29-58 



Phosphorus 15-38 



Platinum was looked for in two portions of fifty grams each, 

 but none was found. Neither is its presence recorded in pre- 

 vious analyses by this same firm, by Derby,* Tassin or Mois- 

 san.f J. W. Mallet, working on a residue from the solution of 

 25 pounds of the iron in dilute hydrochloric acid, obtained 

 results representing 3'63 grams of platinum and 14*95 grams 

 of iridium per metric ton of the original iron, " with probably 

 a trace of rhodium." He suggests that the platinoid metals 

 are not uniformly distributed in the iron.;); This may account 

 for the failure to find it on the part of others. The quantity 

 of material worked upon is undoubtedly an important factor, 

 however. 



(2) Iron. Casas Grandes, Mexico. -Medium octahedrite. 

 Previously analyzed and described by Tassin. § The results 

 of Dr. Whitfield's analysis are given in column I below. In 

 column II are given Tassin' s results as previously obtained. 



1 II 



Silicon 0*010^ 



Iron. 90*470 95-13$ 



Nickel 7*742 4*38 



Cobalt 0*604 0*27 



Copper 0-012 trace 



Phosphorus 0*166 0*24 



Sulphur 0-029 none 



Combined carbon. 0*145 



Graphitic carbon _ - 032 



Iron oxides 0*794 



!- traces 



100-004 100*02 



* This Journal, xlix, 101-110, 1895. 



f See Contributions to the Study of the Canyon Diablo Meteorite, by G. 

 P. Merrill and W. Tassin, Smith. Misc. Colls., Quar. Issue, 1, pt. 2, p. 209. 

 tProc. Acad. Xat. Sci. Phila., Dec, 1905, 913 ; footnote on p. 862. 

 §Proc. U. S. Nat. Mus., xxv, 69-74, 1902. 



