4 Field Columbian Museum — Geology, Vol. III. 



of an inch, and rejecting the drillings from the crust portion. For 

 the determination of iron, nickel, and cobalt, a portion of 1.3733 

 grams was dissolved in strong hydrochloric acid. Solution took 

 place rapidly and completely, only a few unweighable black flecks 

 being left after oxidation with nitric acid, evaporation to dryness 

 and addition of water. Iron was precipitated three times by treat- 

 ment with ammonia and ammonium chloride as directed by Frese- 

 nius, except that a large excess of the reagents was used. After 

 solution with sulphuric acid and reduction with hydrogen sulphide, 

 the determination was made by the usual titration with potassium 

 permanganate. Copper was precipitated by hydrogen sulphide from 

 the filtrate from the iron precipitate and then determined electro- 

 lytically. Nickel and cobalt were separated in acetic acid solution 

 as sulphides and separated by potassium nitrite. Nickel was then 

 determined electrolytically, but cobalt as sulphate, the electro- 

 lytic determination of this element having proven at times unreliable. 

 Manganese was tested for in a portion of 2.8248 grams dissolved in 

 nitric acid and oxidized with potassium chlorate according to Ford's 

 method. No precipitate was obtained. The treatment with nitric 

 acid showed the meteorite to be passive until water was added. 

 Sulphur and phosphorus were determined in a portion of 4.8321 

 grams dissolved in fuming nitric acid by the slow addition of hydro- 

 chloric acid. From this sulphur was precipitated as directed by 

 Blair when iron is present, purified by fusion with sodium carbonate, 

 and weighed as barium sulphate. Phosphorus was determined by 

 the acetate method and weighed as magnesium pyrophosphate. 

 Carbon was determined in a portion of 2.5678 grams by oxidation 

 with chromic and sulphuric acids and weighed as carbon dioxide. 

 During the treatment the odor of hydrocarbons was observed, similar 

 to that obtained in the solution of pig iron. This indicated that 

 some of the carbon was present in a combined form, while an insoluble 

 residue showed that some existed as graphite. The analysis gave the 

 following results: 



Fe 89.84 



Ni 8.79 



Co 0.28 



Cu 0.07 



P 0.80 



S 0.02 



C 0.09 



99.89 

 The composition of the meteorite is thus seen to be that usual to 

 medium octahedrites, with a high percentage of phosphorus. From 



