Hail Storms. 



35 



I shall now conclude this paper with the following table, computed 

 from the formulae on page 32, and showing the state of the planes of 

 polarization of the three rays AC, GS, and b s. 



Allerly, December 31, 1829. 



Art. VI. — On Hail Storms: by A. Jones, M. D. of Augusta, 



Georgia. 



These storms very often occur in the Southern States during the 



. spring, or the first months of summer. They are most frequent 



when the thermometer ranges between 70° and 80°. Lightning is 



also more frequent and terrible in the south when the thermometer 



occupies the above range. 



In' hail storms I suppose it highly probable, that at first, large drops 

 of rain descend, till they come in contact in their passage, with a 

 much colder current of air, when they suddenly freeze, in the act 

 of doing which they expand, producing a hollow globular hailstone, 

 which enlarges as it falls, by the aggregation and freezing of other 

 drops of water, which seem to be drawn to it by some kind of at- 

 traction. They in this way enlarge, until before they reach the earth, 

 they often attain a most astonishing size. They have been seen to 

 fall in some places, of the size of hens' eggs, and of still larger 



