DEPAETMENT OF METALLUEGY AND ECONOMIC GEOLOGY. 147 



entire mineral exhibit of Sonora was presented to the Museum, and forms 

 a very valuable addition to our collections. 



From Pachuca was obtained a very large and interesting collection, 

 including very complete illustrations of the mines of the Eeal del Monte 

 Mining Company, which are especially valuable as having been taken 

 with the view of representing the various mines of the Eeal del Monte 

 Mining Company, and containing many specimens taken from many 

 different locations in the mines. These collections were presented by 

 Jose de Landeros y Cos, director of the Eeal del Monte Mining Com- 

 pany, through Mr. Drocina. 



Mr. Drocina also presented collections from the States of Hidalgo, 

 Durango, Oaxaca, Mexico, Michoacan, Guerrero, Tlascala, Puebla, San 

 Luis Potosi, and Guanajuato. These collections are some of them quite 

 small, only a few specimens being obtained from some States, but taken 

 as a whole they form an excellent illustration of the mineral resources 

 of the country. 



The material gathered at New Orleans will be of great value in filling 

 gaps in our ore collections ; besides this, the way has been opened for 

 future acquisitions, either by purchase or exchange, of much material 

 that will be desirable to obtain. 



After the return of the curator to Washington the latter part of June, 

 the collections donated to the Museum by the American Institute of 

 Mining Engineers began to arrive, and claimed attention till the close 

 of the year. 



