208 



VIEWS OF NATURE. 



washings occur, which are now proceeding with so much 

 activity. 



Besides the hypsometric levelling and the barometric mea- 

 surements to which I have already referred (see page 33), 

 between the mouth of the Kanzas River in the Missouri and 

 the coast of the Pacific, throughout the immense expanse of 

 28° of longitude, Dr. Wislizenus has successfully prosecuted 

 the levelling commenced by myself in the equinoctial zone of 

 Mexico, to the north as far as to lat. 35° 38', and consequently 

 to Santa Fe del Nuevo Mexico. We learn with astonishment 

 that the plateau which forms the broad crest of the Mexican 

 Andes by no means sinks down to an inconsiderable height, 

 as was long supposed to be the case. I give here, for the first 

 time, according to recent measurements, the line of levelling 

 from the city of Mexico to Santa Fe, which is within 16 

 miles from the Rio del Norte. 



Mexico 



Tula 



San Juan del Eio 



Queretaro 



C el ay a 



Salamanca 



Guanaxuato 



Silao 



Villa de Leon . 



Lagos 



Aguas Calientes 



San Luis Potosi 



Zacatecas 



Fresnillo 



Durango . 



Parras 



Saltillo . 



El Bolson de Mapinii 



Chihuahua 



Cosiquiriachi 



Passo del Norte (on the Eio Grande l orr >-T 



del Norte) 

 Santa Fe del Nuevo Mexico 



French feet. 



7008 . 



6318 . 



6090 . 



5970 . 



5646 . 



5496 . 



6414 . 



5546 . 



5755 . 



5983 . 



5875 . 



5714 . 



7544 . 



6797 . 



6426 . 



4678 . 



4917 . 

 3600 



4200 * 



4352 . 



5886 . 



from 

 to 



1 1 



>35 

 6612 



English feet. 

 7469 

 6733 

 6490 

 6362 

 6017 

 5761 

 6836 

 5911 

 6133 

 6376 

 6261 

 6090 

 8038 

 7244 

 6848 

 4985 

 5240 

 3836) 

 4476J 

 4638 

 6273 



3810 



7047 



Ht. 

 Ht. 

 Ht. 

 Ht. 

 Ht. 

 Ht. 

 Ht. 

 Br. 

 Br. 

 Br. 

 Br. 

 Br. 

 Br. 

 Br. 

 (Oteiza) 

 Ws. 

 Ws. 



Ws. 



Ws. 

 Ws. 



Ws. 



Ws. 



The attached letters Ws., Br., and lit., indicate the baro- 

 metric measurements of Dr. TVislizenus, Obergrath Burkart, 

 and myself. To the valuable memoir of Dr. Wislizenus there 



