BUILDING AND ORNAMENTAL STONES. 615 



Hornblende andesite (?). Reddish gray. San Juan de los Llanos, State of Puebla. 



Mexican Geographical Exploring Commission, 1885. 38001. 

 Basalt. Dark gray ; vesicular, with large olivines. State of Zacatecas. Mexican 



Geographical Exploring Commission, 1885. 37786. 



Gray ; vesicular. State of Oaxaca. Mexican Geographical Exploring Com- 



mission, 1885. 37754. 



Gray ; vesicular. State of Oaxaca. Mexican Geographical Exploring Com- 



mission, 1885. 37755. 



Light gray ; coarsely and finely vesicular. State of Mexico. Mexican Geo- 



graphical Exploring Commission, 1885. 37701. 



Nearly black ; vesicular. State of Mexico. Mexican Geographical Exploring 



Commission, 1885. 37799. 



Nearly black ; finely and coarsely vesicular. Two specimens. State of Puebla. 



Mexican Geographical Exploring Commission, 1885. 37699. 



Dark brown; coarsely vesicular. State of Mexico. Mexican Geographical 



Exploring Commission, 1885. 37802. 



Black; coarsely vesicular. Tula, State of Mexico. J. S. F. Batchen, 1884. 



' 36792. 



Basalt (?). Fine; reddish brown. State of Hidalgo. Mexican Geographical Explor- 

 ing Commission, 1885. 37808. 



Reddish brown ; vesicular. State of Mexico. Mexican Geographical Explor- 



ing Commission, 1885. 37700. 



Dark brown ; coarsely vesicular. State of Mexico. Mexican Geographical 



Exploring Commission, 1885. 37798. 



Dull red ; very vesicular. State of Mexico. Mexican Geographical Exploring 



Commission, 1885. 37773. 



Reddish brown ; vesicular. San Miguel, San Salvador (?). Mexican Geograph- 



ical Exploring Commission, 1885. 37687. 



Reddish brown ; finely vesieular. Toluca. Mexican Geographical Exploring 



Commission, 1885. 38128. 



Basalt (?)tuff. Black; friable. State of Mexico. Mexican Geographical Explor- 

 ing Commission, 1885. 37792. 



Basaltic (?) tuff. Dull grayish ; finely vesicular. San Miguel. Mexican Geograph- 

 ical Exploring Commission, 1885. 37690. 



Pumice. Fine ; light gray. State of Hidalgo. Mexican Geographical Exploring 

 Commission, 1885. 37864. 



Gray ; finely and coarsely vesicular. Two specimens. San Juan de los Llanes, 



State of Puebla. Mexican Geographical Exploring Commission, 1885. 37698. 



Pumice tuff. Compact ; very light gray ; soft and friable. State of Hidalgo. Mex- 

 ican Geographical Exploring Commission, 1885. 37809. 



Dacite. Fine ; light reddish. State of Mexico. Mexican Geographical Exploring 

 Commission, 1885. 37716. 



Sandstone. Greenish. 5 by 4 by 3£ inches. State of Guanajuato. J. S. F. Batchen, 

 1884, 36794. 



Greenish. 5 by 4 by 3£ inches. State of Guanajuato. J. S. F. Batchen, 1884. 



36795. 



Light brown. 5- inch cube. State of Aguas Calientes. J. S. F. Batchen, 1884. 



36803. 



Fine; gray. State of Morelos. Mexican Geographical Exploring Commission, 



1855. 37997. 



