146 



REPORT 1867. 



Table XXXVI. — Showing the number of Daj^s on which Lightning was 

 seen, or Thunder heard, in each Month and Year, from lyGO to 1866, 

 both inchtsive. 



Table XXXVII. — Showing the Mean Values of the principal Meteorological 

 Elements for each Observation Hour, derived from Six-hourly Observa- 

 tions taken daily during Seven Years (1800-66). 



It appears from Table XXXVII. that the march of the diy pressure is 

 similar to that of the total or atmospheric pressure, the rise and fall for both 



being as foUoAVS : — 



