METEORIC IRONS OF NORTH MEXICO. 



371 



locality, the geography of which I will now describe, referring 

 to the accompanying diagram for details. 



The Bolson de Mapini, or Mexican Desert, occupies the 

 western portion of the province of Cohahuila and the eastern 

 portion of the province of Chihuahua. It is four hundred 

 miles from east to west, and five hundred miles from north to 

 south, bounded on the north by the river Eio Grande. Some 

 of the villages and haciendas are specified in the diagram, and 

 the numbers 1, 2, 3, etc., are the localities of the different mete- 

 oric masses discovered. 



%>4 



CONCEPTION. «%( 



D U RA N G O 



No. 1. — The locality of the Cohahuila meteorite, described 

 by me in the Amer. Jour, of Science and Arts, April, 1854 ; it 

 is now in the Smithsonian Institution. 



No. 2.— The locality of the Cohahuila meteorite of 1868, 

 described by me in the Amer. Jour, of Science and Arts, April, 

 1870; it is now in the possession of Dr. Butcher. 



No. 3. — The locality of the San-G-regorio meteorite just 

 described ; it is still in the place where it was first observed. 



No. 4.— The locality of the mass described and figured in 

 my memoir on meteorites (Amer. Jour, of Science and Arts, 

 April, 1854), and called the Chihuahua meteorite; it is still in 

 place at the Hacienda de Conception, ten miles from Zapata, 

 its greatest height being forty-six inches, breadth thirty-seven, 

 and in the thickest part eight feet three inches in circumference. 



