344 Dexoey on Geology of Williamstozon, ire. 



At the north end of Saddle Mountain, but low down, yellow 

 earth is connected with reddle, or a substance much resembling 

 it. It is less hard than the common reddle, but is composed 

 of the same ingredients. 



Magnetic Oxyd of Iron, regular octaedrons, in mica slate at 

 the base of Stone Hill. 



Supersulphuret of Iron, massive and crystallized, in argilla- 

 ceous slate, mica slate, compact limestone, and quartz. 



17. Prase. Beautiful, and containing sulphuret of iron; 

 lately found by Mr. Eaton, a little east of the summit of Hoc- 

 sack Mountain, in Florida. 



18. Puddingstone. Where Pownal Mountain reaches the 

 Hoosack, (T) 3 miles north of the college, are some hills of 

 this aggregate. It is composed of rounded masses of quartz, 

 chlorite, and limestone, of various sizes, connected by an ar- 

 gillaceous cement. 



19. Potters^ Clay. Excellent for vessels of common pottery. 



The minerals of this section, it is obvious, are not very im- 

 portant ; but as connected with a transverse section of the 

 country, they possess considerable interest. For this reason 

 they have been particularly mentioned. 



In the north part of Williamstown is a mineral spring, fami- 

 liarly called the Sand Spring (S.) The water rises from seve- 

 ral places in a reservoir of about a rod in diameter, and from 

 one to three feet deep. It is very soft and warm, but contains 

 Tery Uttle saline or earthy matter. Gas continually rises in 

 it. It appears much to resemble the spring at New Lebanon, 

 New-Yoric, and has proved useful in the cure particularly of 

 some cutaneous diseases. 



The transverse section, connected with the map, passes over 

 Stone Hill, and the north part of Saddle Mountain. The dif- 

 ferent rocks are shown in the section, directly below their 

 places on the map, by drawing lines from the several strata 

 parallel to the sides of the map. This section is connected 

 with that given by Mr. Hitchcock, in the 2d number of this 

 Journal. It ought perhaps to be mentioned, that according 

 to Mr. Eaton's account, the granite of this section sinks under 



