44 INTRODUCTION. 



fnow, high winds, and florms. In very hot wea* 

 ther the falling of the mercury indicates thunder j 

 in winter, the rifmg prefages frofl j and in frofty 

 weather, if the mercury falls three or four divi^ 

 fions, there will certainly follow a thaw ; but in a 

 continued froft, if the mercury rifes, it will certainly 

 fnow. 



'^ When foul weather happens foon after the falling 

 of the mercury, expedt but little of it ; and, on the 

 contrary, exped but little fair weather when it proves 

 fair fliortly after the mercury has rifen. In foul 

 weather, after the mercury rifes much and high, and 

 fo continues for two or three days before the foul 

 weather is quite over, then exped: a continuance of 

 fair weather to follow. 



^' In fair weather, when the mercury falls much and 

 low, and thus continues for two or three days before 

 the rain comes, then exped a great deal of wet, and 

 probably high winds. 



" The unfettled motion of the mercury denotes un» 

 certain and changeable weather. 



" You are not fo ftridly to obferve the words en« 

 graved on the plates (though, for the moft part, it 

 will agree with them), as the mercury's rifmg and fall- 

 ing ; for if it flands at much rain^ and then rifes up I 

 to changeable^ it prefages fair weather, although not 

 to continue fo long as it would have done if the mer- 

 cury were higher ; and fo, on the contrary, if the 

 mercury flood 2Xfair^ and falls to changeable^ it pre- 

 fages foul weather, though pot fo much of it as if 

 it had funk down lower." 



From 



