84 BULLETIN t>l, UNITED STATES NATIONAL MUSEUM. 



it as the result of rapid cooling of a liquid magma. It was from work 

 upon fragments of this stone that A. W. Wright was enabled to make 

 the important generalizations on gases in stony meteorites men- 

 tioned on p. 8. 



References. — C. W. Giimbel, Sitz k. bayr. Akad. Miinchen, 1875, 

 pp. 313-330. A. Lasaiilx, Sitz. Niederrh. Ges., 1882, pp. 102-105. 

 M. E. Wadsworth, Lithological Studies, 1884, p. 8G. 



HONOLULU, HAWAIIAN ISLANDS. No. 278. 



Stone, Cwa. Fragment weighing 13.5 grams, showing a portion of 

 the crust. Fell September 27, 1825. 



HOPPER, HENBY COUNTY, VIRGINIA. No. 159. 



Iron. Twenty-seven grams from a mass weighing 1.7 kilograms, 

 found in 1889. Gift of H. B. Battle. 



HVITTIS, ABO LAN, FINLAND. No. 400. 



Stone, Cck. Triangular fragment with crust, weighing 70 grams. 

 Fell at midday October 21, 1901. Weight of original mass 14.04 

 kilograms. This fall was made the subject of an exhaustive study by 

 L. H. Borgstrom, who from chemical and microscopic studies made 

 the following calculation of its mineral composition : 



Per cent. 

 Oldhamite 0.86 



Daubreelite -57 



Troilite 7.31 



Pliosplior-nickel-iron .50 



Nickel-iron 21. 50 



Enstatite 59.01 



Orthoclase 9-86 



Chromite • 32 



99. 93 

 The chemical composition was found to be as follows : 



Per cent. 



Silica (Si02) 41.53 



Iron (Fe) 24.66 



Ferrous oxide (FeO) .34 



Nickel (Ni) 1- i>G 



Cobalt (Co) . -07 



Alumina (AUOs) 1-55 



Chromic oxide (CrjOs) • 57 



Lime (CaO) "1-41 



Magnesia (MgO) 23.23 



Potash (K=0) -32 



Soda (NazO) 1-26 



Sulphur (S) 3.30 



Phosphorus (P) -08 



100.28 



