146 DOMAIN IX. ANOMALOUS. 



It must not be forgotten that a mountain of 

 salt has recently been discovered on the western 

 side of the river Missouri, in North America. 



In the salt mines of England, Pictet observed 

 a singular structure, somewhat resembling that 

 of basaltic columns. In those of Poland, a simi- 

 lar polygonal structure has also been observed, 



but was supposed to arise from large globules 

 compressed on all sides by others. Further con- 

 siderations on rock-salt may be found in many 

 mineralogical treatises ; and are scarcely requi- 

 site in a work of this nature*. 



HYPONOME I. 



Entire saline rock, blue, red, white. 

 Micronome 1. Mixed with gypsum. 



* The numerous and prodigious rocks of ice in the polar regions, 

 might afford an interesting description j but are foreign to thi* 

 work. 



