284 HYPSOMETRIC ADDENDA. 



town is less than four German (sixteen English) geographical 

 miles from the Rio del Norte. 



French Feet. Eng. Feet. Observer. 



Mexico .......... 7008 7490 Ht. 



Tula ........... 6318 6733 Ht. 



San Juan del Eio ...... 6090 6490 Ht. 



Queretaro ......... 5970 6363 Ht. 



Celaya. . : ........ 5646 6017 Ht. 



Salamanca ......... 5406 5761 Ht. 



Guanaxuato . . ....... 6414 6836 Ht. 



Silao ........... 5546 5910 Br. 



Villa de Leon ........ 5755 6133 Br. 



Lagos ........... 5983 6376 Br. 



Aguas Calientes ....... 5875 6261 Br. 



San Luis Potosi ....... 5714 6090 Br. 



Zacatecas .......... 7544 8040 Br. 



Fresnillo .......... 6797 7244 Br. 



Durango .......... 6426 6848 (Oteiza) 



Parras ........... 4678 4985 Ws. 



Saltillo .......... 4917 5240' Ws. 



ElBolsondeMapimi 



Chihuahua . . , ...... 4352 4638 Ws. 



Cosiquiriachi ........ 5886 6273 Ws. 



Passo del Norte, on the Rio Grande del 



IN or! o 

 Santa Fe del Nuevo Mexico . . . 6612 7047 Ws. 



The letters Ws., Br., and Ht., are placed to distinguish the 

 barometric measurements of Dr. Wislizenus, Oberbergrath 

 Burkart, and my own. Wislizenus has appended to his 

 valuable memoir three vertical sections of the surface of the 

 ground : one from Santa Fe to Chihuahua by Passo del 



