MEMOIR ON METEORITES. 281 



resembling the representation we have of the etched surface 

 of Hauptmannsdorf iron. Schreibersite is visible in the iron, 

 but so inserted in the mass that it can not be readily detected 

 by mechanical means. Hydrochloric acid leaves a residue 

 of beautifully brilliant patches of this mineral. Subjected to 

 analysis it was found to contain 



Iron 95.82 



Cobalt 35 



Nickel 3.18 



Copper, minute quantity, not estimated. 

 Phosphorus .24 



99.59 

 Which corresponds to 



Nickeliferous iron 98.45 



Schreibersite 1.55 



100.00 



The iron is remarkably free from other constituents. It is 

 especially interesting as the largest mass of meteoric iron in 

 this country next to the Texas meteorite at Yale College. 



4. Meteoric Iron from Tucson, Mexico. 



We have had several accounts of meteoric masses which 

 exist at Tucson, Dr. J. L. LeConte having made them known 

 some few years ago. Since that time Mr. Bartlett, of the 

 Boundary Commission, has seen them and made a drawing 

 of one which he has kindly allowed me the use of, as well as 

 the manuscript notice of them, which is, however, quite brief. 

 This mass is used for an anvil, resembles native iron, and 

 weighs about six hundred pounds. Its greatest length is five 

 feet. Its exterior is quite smooth, while the lower part which 

 projects from the larger leg is very jagged and rough. It was 

 found about twenty miles distant toward Tubac, and about 

 eight miles from the road, where we are told are many larger 

 masses. The following figure (3) represents the appearance 

 of that meteorite. 



Since my communication last April I have obtained frag- 

 ments of the meteorite from Lieut John Gr. Parke, of the U. S. 

 Topographical Engineers, who cut them from the mass at 

 Tucson, and to whose kindness I feel much indebted. 



Some of the fragments were entirely covered with rust, and 



