CLIMATE of RUSSIA. 221 



2dly, A Mr Schroeter of this city has found the water of 

 thefe incruftations to be of a very volatile nature ; and indeed 

 the folutions of all the frigorific productions mentioned above, 

 poflefs a fuperior difpofition to evaporate to river water in its 

 natural flate, as is fhown by the following experiment : 



He poured into five tea-cups, (landing in the window of his 

 room, a tea-fpoonful of each of the five different fluids men- 

 tioned below, when, at the expiration of 24 hours, their com- 

 parative degrees of evaporation were as follow : 

 No. 1. A tea-fpoonful of window cruft water was almoft all 



evaporated. 



2. hoar froft water had loft about the half. 



3. fnow water had loft about a third. 



4.. Neva ice water had loft rather lefs 



than a third. 



5, River Neva water had loft nothing 



to appearance. 



Hail. 



Its appearance is a rare phenomenon in this feafon : But I 

 fhall leave to the ingenious author of the Theory of Rain *, (in 

 the firft volume of the Tranfaclions of the Royal Society of 

 Edinburgh) to give a reafon why water mould conftantly take 

 the form of fnow during the fevere weather of the north, and 

 fo feldom that of hail. Can it be that the fun has not fufficient 

 influence, at this period of the year, to raife it to the higher 

 region, where the form of hail is fuppofed to be given ? 



'Tempejls 



Are equally uncommon with hail in the feafon treated of. 

 Indeed nature feems to have ftudied a perfect equality in the 

 diftribution of her favours, as it is only the parts of the earth 



which 



* Dr James Hutton* 



