28 



ON THE DIURNAL AND ANNUAL VARIATIONS OF 



Taking each monthly formula separately, and giving to n succes- 

 sively the values 0, 1, 2, 3, &c., we obtain for that month the mean 

 normal temperatures for each of the twenty-four hours, as far as the 

 normals can be procured from the observations of only three years. 



The results are given in the following table, in which the numbers in 

 the final column for the year are the arithmetic means from the corres- 

 ponding twelve monthly numbers. 



TABLE 11. 



Monthly Mean Normal Temperatures, at Halifax, for each of the twenty-four hours, from 

 Bi-hourly Ohservations in the three years 1S67-69. 



If the difference of each hourly normal in excess or defect from the 

 means for twenty-four hours given at the foot of each column be taken, 

 we have the diurnal variations given in Table III. 



