208 



VIEWS OF NATUEE. 



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 HO 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. 



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

 metric measurements of Dr. Wislizenus, Obergrath Burkart, 

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



