Meteorological Journal for the year 1840, 



345 



Mr. Graham Hutchinson read a paper on a method of prognos- 

 ticating the probable mean temperature of the several winter 

 months, from that of corresponding months in the preceding 

 summer. 



Mr. Wm. Bald continued a series of observations made in 

 1839, and 1840, on the tides in the harbor of Glasgow, and the 

 velocity of the Tidal Wave in the estuary of the river Clyde, 

 between Glasgow and Port Glasgow. 



[The remainder is unavoidably deferred to the next number. 1 



Art. IX. — Abstract of a Meteorological Journal for the year 

 1840, kept at Marietta, Ohio, Lat. 39° 25' iV., and Lon. 4° 

 28' W. of Washifigton City; by S. P. Hildreth, M. D. 



Remarks on the year 1 840. — The mean temperature for the 

 year is 52.35°, which varies but a small portion of a degree from 

 that of the preceding year. The amount of rain and melted snow 

 is 39.09 inches, which is a few inches below the annual mean for 

 this place, but is about six inches greater than that of the prece- 

 ding year. The distribution has been regulated in a remarkable 

 manner, so as to be most abundant in those months, where the 

 heat and evaporation are the greatest, and moisture most needed 

 for the growth of plants and fiUing out the ripening grain. The 

 mean temperature for the several seasons is as follows. — N. B. The 

 winter embraces December of 1839. 



