[ 497 ]. 



C H A P. VI^ 

 Prognqftics. 



When the barometer falls, and the hygrometer rifes, rain is an-^ 

 noanced; 



When the barometer rifes, aud the hygrometer falls, we may 

 exped fair weather, if farther changes do not appear in thefe in- 

 ilruments, as fometimes there fuddenly do. 



If the barometer falls' and the hygrometer alfo, 'Wittdy weather 

 will probably follow — particularly if the barometer falls much be-- 

 Ibw its natural-height, which in Dublin is from 29,9 to 29,98. 



Again, in the morning the hygrometer is generally higher than 

 at noon, by reafon of the difference of temperature; but if it 

 ftands lower at noon in a greater proportion than the difference of 

 temperature demands, it prognoflicatesy^/r weather. — On the con- 

 trary, if at noon it be higher than it flood in the morning, rain- 

 may be expeded. Sauff. Hygr. p. 356, 



