ON THE DIURNAL AND ANNUAL 

 VARIATIONS OF TEMPERATURE 



AT HALIFAX, NOVA SCOTIA. 



BY G. T. KINGSTOK, M.A., 



Director of the Magnetic Observatory, Toronto. 



Prom Bi-Houbly Observations by F. ALLISON, M.A., during the Three Years 1867-69. 



For developing tte climatology of this country, two or more chief 

 stations in each province are needed, differing from ordinary stations, 

 partly in the extent of their instrumental appliances, and partly in the 

 frequency of the observations. 



One of the leading objects of these chief stations has been carried 

 out by Mr. Allison, of Halifax, by making the observations from which 

 the results given in this paper are derived. The nature and purpose 

 of these results will be understood from the following considerations. 



The majority of observers, being engaged in their various callings, 

 cannot usually observe often enough in the day, nor persevere for a 

 sufficient number of years for the collection of materials adequate for 

 the calculation of the normal values of the elements proper to their 

 several stations. 



Their observatiens can however to a great extent be made compar- 

 able with those carried on more frequently, and extended through a 

 long term of years, by applying corrections deduced from the observa- 

 tions made at a few well equipped chief stations and continued through 

 a long series of years, during a portion of which the observations have 

 been taken at equal intervals not exceeding three hours. 



The corrections are of two kinds. First, the corrections by which 

 compensation is made for the insufficient frequency of the observations 

 at ordinary stations ; and, secondly, those which compensate their 



