No.1.) RESEARCHES ON METEORITES— MERRILL. 15 



Per cent. 



Manganese ! 080 



Iron 89. 700 



99. 982 

 with no traces of tungsten, vanadium, or molybdenum. 



The silicate portion yielded : 



Percent. 



SiKcaCSiO,) 47.36 



Alumina (ALOa) 5. 67 



Ferric oxide (FcjOj) .10 



Ferrous oxide (FeO) 11. 25 



Lime (CaO ) 84 



Magnesia (MgO) 31.72 



Manganous oxide (MnO) .36 



Soda (Na^O) 2. 42 



Potash (K2O) 23 



Titanic oxide (TiOo) None. 



99. 95 

 Combining the metallic and nonmetaUic portions and recalculating with the usual assump- 

 tion that the mineral called troihte is the monosulphide FeS, and that the schreibersite conforms 

 to the formula FcjNiP, the following figures are obtained representative of the composition of 

 the stone as a whole : 



Per cent. 



Silica (SiOo) 35. 30 



Alumina ( AUOj) 4.. 24 



Ferric oxide (Fe203) 75 



Ferrous oxide (FeO) 8. 38 



Lime (CaO) 62 



Magnesia (MgO) 23. 631 



Manganous oxide (MnO) 268 



Soda (NajO) 1. 804 



Potash (KoO) 171 



Sulphur (S) 2.184 



Phosphorus (P) 0138 



Nickel (Ni) 1. 80 



Cobalt (Co) 098 



Copper (Cu) 008 



Chromium (Cr) 029 



Carbon (C) 017 



Manganese (Mn) 015 



Irou (Fe) 21. 270 



100. 5988 



None of the rarer elements, other than those noted, were found. 



(10) Meteoric stone, Chondrite. — Elm Creek, Kans. This stone was plowed up in a field 

 some time in May, 1906. Nothing is known of its fall. It was considerably oxidized on the 

 outside, indicating that it had lain some time in the soQ. It is described by Howard" as of a 

 dark gray, nearly black color, thickly studded on a polished surface with metaUic points and in- 

 distinct chondrules, which break, in part, with the groimdmass. The silicate portion, as shown 

 by the microscope, consists essentially of olivine and enstatite with a polysynthetically twinned 

 monochnic pyroxene. It had never before been subjected to chemical analysis, and was there- 

 fore open to critical investigation. Dr. Whitfield found: 



Per cent. 



Silicates 93. 18 



Metal 6.82 



100. 00 

 Amer. Journ. Sci., vol. 28, 1907, p. 380. 



