$9 ^ Meteorology. 



forms a fait not foluble in alcohol, and with difficulty iq. 

 water. The neutral falts formed with this alkali, and the. 

 nitrous, muriatic, and phofphoric acids, and thofe in parti- 

 cular formed with the acetous acid, diflblve with eafe not 

 only in water but in alcohol. Its muriate eryftallifes in the 

 form of feathers : its phofphate has a bitter tafte. All thefe 

 falts, except thofe formed by the phofphoric acid, part with 

 their acids by heat, and the alkali remains pure : the fulphate 

 requires for that purpofe a red heat; the nitrate only 300° of 

 .Fahrenheit : it does not detonate on ignited coals; nor does 

 it decrepitate, or become luminous, when thrown on them. 



It is difficult tofaturate this alkali with carbonic acid, as it 

 lets it efcape in the ufual temperature of the atmofphere : 

 when faturated with it, it affumes the form of a light earthy 

 fait. 



This alkali exercifes an a£lion on vegetable colours. It 

 precipitates metals and earths from their folutions in acids, 

 and in the fame manner as the other alkalies. It produces no 

 change on incrcurius dulcis, but it gives to corrofive fublimate 

 the colour of carmine. It precipitates the nitrate of mercury 

 black. When combined with oils, it forms a foap which 

 diffolves in alcohol. Lime, precipitated by it from muriate 

 of lime, is foluble in diftilled water. It does not decompofe 

 muriate of ammonia but at a heat of 100 of Fahrenheit. 



METEOROLOGY. 



During the violent ftorm on Sunday the 9th of November 

 laft, the mercury in a barometer at Walthamftow, Elfex, 

 was very vifibly agitated ; the vibrations up and down were 

 perhaps about four hundredth parts of an inch. This vibra- 

 tion was obferved by feveral perfbns, and was feen at different 

 periods of the day, during which the mercurv rofe very conr. 

 fjderably. 



The fame circumftance was obferved in other places. 



