Meteorological Observations at Marietta, Ohio. 239 
December, 1847.—Mean 35°-33; rain, December 10th, 10 inches ; 
flood the 15th of the month, covering the bottoms; rain 52°31 
inches; the 27th, Ohio full of floating ice, but not closed all 
r . 
“ 1848.—Mean 42°°16; no ice until January; open all winter. 
“ 1849.—Mean 319-33; no ice in the Ohio till the last of the 
52°30 inches ; rivers open; little ice 
“ 1851.—Mean 28°-00; very cold; below zero a number of 
mornings; Ohio closed the 19th of the month and opened again 
the 30th. 
month. beaks 
“ 1850.—Mean 34°66; rain this month 7 inches; for the year 
The mean temperature for the winter months is 36°:56, not 
far from the mean of our winters. 
The mean of the spring months in 1851, is 53°41. The blos- 
of property afloat on the Ohio, 2000 boats were counted in 
hours by Re ascending steamer, between the mouth of the pamper 
and Marietta, a distance of about 200 miles. A large number 
