Native Nitrate of Soda. 279 
delicate than the “perspectiva.” I have never 
found it upon rotten wood, nor under the bark of 
old logs, the common habitat of the “ perspectiva." 
PALUDINA CINCINNATIENSIS. 
Plate III. fig. 3. 
Shell somewhat ventricose, subumbilicate, color 
delicate green. Whorls four, smooth; spire entire 
at the apex and prominent ; suture deeply impressed ; 
aperture much dilated, approaching to orbicular, 
nearly half the length of the shell; length one fifth 
of an inch. 
Found in the canal near Cincinnati, clinging to 
small stones. am . 
ARTICLE V.— NOTICE OF NATIVE NITRATE OF SODA, CON- 
TAINING SULPHATE OF SODA, CHLORIDE OF SODIUM, 
IODATE OF SODA, AND CHLORIODIDE OF SODIUM, from 
the Province of Tarapaca, Pampa of Tamarugal, in South Peru; and of 
ALGOROBA WOOD, from the buried forests beneath the end of 
Tamarugal. By A. A. Haves, M. D. From a letter to M. Gay, 
Cur urator of Mineralogy and Geology i in the Society. 
In presenting these specimens for the Cabinet of 
the Society, I wish to make the first publie an- 
nouncement of the discovery of Iodate of Soda, as a 
new mineral species. 
The nitrate of soda, as the source from which the 
refined nitrate of soda of commerce is obtained, is an 
important and valuable salt, in an economical point 
of view. In the province of Tarapaca, it occurs 
mixed with more or less of the sulphate of soda 
2 o a 
