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ARTICLE IV. 
On two Storms which were experienced throughout the United States, in the month of Feb- 
ruary, 1842. By Elias Loomis, Professor of Mathematics and Natural Philosophy in 
Western Reserve College. Read May 26, 1843. 
Tue favour with which my account of the storm of December 20, 1836, has been 
received, has induced me again to undertake a similar investigation. A remarkable 
tornado was experienced in the north-east part of Ohio, February 4, 1842, an account of 
which may be found in the American Journal of Science, Volume xliii., pages 278—300. 
I was induced to hope that a careful investigation of the phenomena of the general storm 
which accompanied the tornado, might throw some light upon the origin of the tornado 
itself. Hence this storm was selected for investigation. Another very remarkable storm 
having been experienced about the middle of the same month, it occurred to me that I 
might obtain the materials for an investigation of both storms with about the same ease as 
for one. In collecting these materials, I have to acknowledge my obligations to my corre- 
spondents. To Professor Bache, Iam indebted for.a copy of the observations made in 
the State of Pennsylvania, ‘T’o Professor Eispy, I am indebted for a large mass of infor- 
mation he has, with great pains, collected, and which he has generously placed at my 
disposal. ‘The remaining observations were chiefly obtained by direct application to the 
observers. I have thus obtained sixty-eight registers, containing barometric observations. 
The situation of the stations, and the authority upon which the observations rest, are 
shown in the following table. 
STATION. LATITUDE. | LONG. AUTILORITY. 
Natchez, Mississippi, 31°34’ N.| 91°25’ | Dr. Henry Tooley. 
Vicksburgh, Mississippi, 32 24 91 6 | N. W. Hatch. | 
Bloomington, Lowa, 41 26 91 (2 |-0.:8. Parvin. 
New Orleans, Louisiana, 29 58 90.7% | Dy TP. dillie. 
St. Louis, Missouri, 38 36 89 36 | Dr. B. B. Brown. | 
Mobile, Alabama, 80 42 87 59 | Dr. Stephen B. North. | 
Pensacola, Florida, 30 28 87 12 | Isaac Hulse. | 
Nashville, ‘Tennessee, 36 10 86-49 | Professor James Hamilton. | 
Louisville, Kentucky, 38 3 85 30 | Thomas 8. Caldwell. 
Cincinnati, Ohio, 39 6 84 27 | Professor Joseph Ray. 
“ “ 39 6 | 84 27 | M. G. Williams. | 
Athens, Georgia, 33 59 | 83 32 | Professor C.F. M‘Coy. | 
Portsmouth, Ohio, 38 48 =| 83 3! Dr. S. B. Hempstead. 
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