16 MEMOIRS NATIONAL ACADEMY OF SCIENCES. [vol.xiv. 



The silicate portion yielded: 



Per cent. 



Silica (SiOj) 36. 76 



Alumina (AI2O3) 3. 10 



Ferric oxide (FejOs) 13.23 



Ferrous oxide (FeO) 14. 22 



Chromic oxide {Ct^O^) 35 



Lime(CaO) 1.62 



Magnesia (MgO) 2.5.66 



Water (HjO) 5.10 



100. 04 



No barium, strontium, zirconium, or other rare ek^ments coukl be detected. 

 The metallic portion yielded: 



Per cent. 



Iron(Fe) 87.13 



Nickel (Ni) 11. 30 



Cobalt (Co) : 1. 42 



Manganese (Mn) 15 



Copper (Cu) None. 



100.00 



The amount of metal available (1.35 grams) was not sufficient for an exhaustive examina- 

 tion for the rarer elements. 



(11) Meteoric stone, Chondrite {Ci) . — Fisher, Polk County, Minn. This, the first and only me- 

 teoric stone thus far reported from Minnesota, is supposed to be the representative of a fall which 

 took place on the 9th of April, 1894. It was made the subject of an investigation by Prof. N. H. 

 Winchell," which was, however, not completed. The matter was subsequently taken up by the 

 present writer, and a detailed account of it pubhshed in the Proceedings of the U. S. National 

 Museum.* The stone is described as consisting of a confused aggregate of irregular crystaUine 

 granules of ohvine and pyroxene interspersed -with numerous imperfectly outlined chondrules 

 of the same mineral, throughout wliich are occasional interstitial areas of a colorless, pellucid, 

 isotropic material referred to maskelynite. The pyroxenes are wholly of the enstatite type and 

 devoid of twinned structure. The analyses yielded results as below: 



Par cent. 



Metallic constituents 11. 44 



Silicate constituents 88. 56 



100. 00 

 The silicate portion yielded : 



Pep cent. 



Silica (SiOo) 43. 70 



Alumina (AloOj) 4.96 



Ferrous oxide (FeO) 18.27 



Manganous oxide (MnO) .38 



Nickel oxide (NiO) 23 



Lime(CaO) 2.19 



Magnesia (MgO) - 29.38 



Chromite (FeOCrA) ^^ 



99. 91 

 The metallic portion, freed from the last trace of siliceous matter, yielded: 



T'er cent. 



Iron(Fe) 85.00 



Nickel (Ni) 14.15 



Cobalt (Co) 74 



Copper (Cu) Trace. 



99.89 



a American Geologist, vol. 14, 1S94, p. 389; vol. 17, 1898, p. 173; vol. 20, 1897, p. 316. 

 f> Vol. 4S, 1915, pp. 503-506. 



