point in fig. i, PI. I) show a black glass, interspersed with 

 numerous residuary particles of unfused silicates, which passes 

 down gradually into the unchanged granular stone. Sections 

 of the thicker blebby glass from the lower surface show air 

 vesicles and numerous crystallites imperfectly secreted from 

 the glassy base and too small to be seen in the figure, together 

 with residuary, unfused particles of the original minerals (PI. 

 Ill, fig. 2). 



CHEMICAL COMPOSITION. 



As the nature and extent of the action of such solvents for 

 nickel-iron as mercuric ammonium chloride on the troilite and 

 the silicates of stony meteorites has not been satisfactorily de- 

 termined, the method of magnetic separation was adopted. 

 This, if thoroughly carried out, yields two portions, the one en- 

 tirely free from metal, the other consisting of metal mixed with 

 more or less silicate, troilite, and chromite. 



About 27 grams of the pulverized 'material was submitted to 

 fractional separation by an electro-magnet, the more magnetic 

 portions being finally separated by a weak magnet. Two frac- 

 tions were thus obtained, the larger being entirely free from 

 metal, but containing some material attracted by a strong mag- 

 net. The relative proportions were : 



a. Portion free from metal, 72.05 percent. 



b. Portion consisting mainly of metal,. 27. 95 percent. 



Of each of these a complete analysis was made. By subtract- 

 ing from the figures obtained for b the silica, oxides, and troilite 

 the composition of the metal was deduced, while by combining 

 them in proper proportion with the figures expressing the com- 

 position of a the composition of the total stony part of the me- 

 teorite was found. The usual separation of the stony part into 

 portions soluble and insoluble in hydrochloric acid was also 

 made, and of each a practically complete analysis was obtained. 



