■$— Yearly Mean of Positive Electricity, of Temperature, and of Rela- 

 tive Humidity of the atmosphere at the hours of 6, 9, 12, 3, 6 and 9, 

 from morning till night, based upon daily observations at those hours 

 in 1 86 1 — 1870. 



ELECTRICITY. 



TEMPERATURE. 



RELATIVE HUMIDITY. 



