MEMOIR ON METEORITES. 



283 



Some few particles of olivine were separated mechanically, 

 and readily recognized as such under the magnifying glass in 

 connection with the action of acids, which readily decompose 

 it, furnishing silica and magnesia. Some of the olivine is in a 

 pulverulent condition, resembling that of the Atacama iron. 

 The nickeliferous iron of this Tucson meteorite also resembles 

 that of the Atacama iron. Calculated from the above results 

 it consists of: Iron, 90.91; nickel, 8.46; cobalt, 63; copper, 

 trace= 100.00. 



This meteorite is one of much interest, and it is to be hoped 

 that some of our enterprising TJ. S. Topographical Engineers 

 will yet be able to persuade the owners to part with it, and 

 bring it to this country. 



5. Meteoric Iron of Chihuahua, Mexico. 



For the description of this meteorite I am indebted to the 

 manuscript of Mr. Bartlett, and had hoped to have obtained a 



Fig. 4. 



fragment of it for examination from Dr. Webb, who detached 

 pieces from the mass; but when applied to they were no longer 

 in his possession. It exists at the Hacienda de Conception, 



