206 Correction. 
12. Acid Fumigations. 
Dr Lyman Foot, of the United States’ Army, mentions, 
in a letter to the Editor, the frequent use of fumigations of 
muriatic acid gas, among the troops sick at Plattsburgh in 
the latter part of the year 1819. The disease, which was 
termed typhus icterodes, was of a malignant type; and, 
from the facts stated, the fumigations appear to have had 
a remarkably salutary effect in correcting the vitiated air 
in the wards, and in preventing the extension of the dis- 
ease. 
Dr. Samuel Robinson, of Providence, R. I., has pre- 
pared for the press a Catalogue of American Minerals, 
having the towns, counties, or districts of each State ar- 
ranged alphabetically—the course or distance of each 
mineral from some known place, and whether abundant. 
The value of such a guide to the mineralogist, can be 
duly appreciated only by those who have travelled in 
search of specimens. 
He respectfully solicits the aid of any mineralogist, whe 
can designate any locality, not yet made public. To fa- 
vor such communications he will postpone the publica- 
tion until the Ist of July next. All authorities from which 
he may derive any assistance, will be respectfully ae- 
knowledged in the work. 
Correction. 
Dr. Jeremiah Van Rensselaer, in a Jetter to the Editor, 
states, that in September last he visited Prospect Hill, one 
mile east of the City of Hudson, and found that the “ circle 
of memorial,” mentioned by Mr. Finch, in his paper on 
“the Celtic antiquities of America,” (Vol. VII. p. 155 of 
this Journal,) was nothing more than the foundation of ar 
ancient and demolished wind-mill; ‘it consisted of about 
a dozen rolled masses of quartz, forming an irregular cir- 
cle, with stones placed in the centre.” 
