1868.] C^Qo [Chase. 



to reconcile the discrepant rcsnlts obhiined b}' different obser- 

 vers of the lunar-daily variations in temperature. 



13. These considerations, with the supplementary aid of suf- 

 ficient local observations to adjust the hourly, daily and monthly 

 "establishments," may furnish data for valuable predictions of 

 normal meteorological conditions. 



14. After the direction, magnitude and frequency of the nor- 

 mal changes in the atmospheric pressure and currents have been 

 satisfactorily determined, it seems reasonable to hope that an 

 improved system of " forecasts" may be established which will 

 be veiy advantageous to agriculture and commerce. 



15. The principal terms for meteorological predictions may be 

 thus arranged, in the order of their apparent relative importance 

 at Philadelphia : 



Daily range of temperature and consequent aerial currents ; 



Lunar disturbance of daily barometric pressure ; 



Distance of the sun ; 



Solar declination ; 



Lunar disturbance of monthly barometric pressure ; 



Lunar hour angle and daily tide ; 



Lunar declination ; 



Phase of the moon ; 



Moon's distance ; 



Solar tide ; 



Moon's latitude. 



Normal Ration of Bainfall. 



