202 Miscellanies. 
a larger species, probably the O. giganteus of Prof. H. A single 
four-toed specimen found at this place- has been deposited at the 
Wesleyan University, and which may have pertained to some un- 
known quadruped. Another locality has been discovered by Dr. 
Richard Warner, of Middletown, situated about four miles north of 
the foregoing. It is also understood that Prof. Hitchcock, to whom 
we are indebted for the development of this subject, has obtained 
many additional specimens, comprising a number of new species. —R. 
15. Hot Springs of Arkansaw, &c.—A correspondent under date 
of July 2, 1837, writing from the hot springs states, that the tem- 
perature of the springs is about 154° or 156° Fahr.; that they 
seldom vary ; that the hottest are the largest—that they are numer- 
ous, and that some of them discharge a barrel or perhaps fifty gallons ~ 
of water per minute. 
It is stated also that there is abundance of good salt water about 
forty miles southeast from the springs, and alum in a few places in 
such abundance and so pure that it is used for all the ordinary pur- 
poses. ‘These springs are situated near latitude 34° 30’, and longi- 
tude west from Greenwich 93°. 
16. Fire bricks and hearth stones for furnaces.—In the number 
of this Journal for April (1837) it was stated that excellent fire 
bricks had been made by Mr. Isaac Doolittle, then of Bennington, 
Vermont. That gentleman, now at Fort Ann, New York, requests 
us to state that the bricks were made by Messrs. L. Norton & Son, 
of Bennington. Mr. Doolittle adds—* during my connection with 
the Bennington Iron Works—a period of nearly fifteen years, we 
made repeated trials of all the most noted kinds of fire bricks, both 
English and American, and we have found that those manufactured 
by Messrs. L. Norton & Son, are decidedly superior to all others 
that we ever used ;_ and I would add, that so far as I know and be- 
lieve, the same result has been attained by all persons who have 
used these bricks for lining cupolas, and other purposes requiring a 
highly refractory and durable article.” 
17. Edwardsite—Perfect crystals of this mineral have of late 
been noticed which have the form of the annexed figures. Fig. 1, 
is the more common form; fig. 2, has been observed in a small 
translucent crystal. The dotted plane p, a basal face of the prima- 
ry, often occurs as the result of cleavage, and presents a_ brilliant 
