OP THE POLAR SEA. 31 



The aurora appeared with more or less bril- 

 liancy on twenty-eight nights in this month, and 

 we were also gratified by the resplendent beauty 

 of the moon, which for many days together per- 

 formed its circle round the heavens, shining with 

 undiminished lustre, and scarcely disappearing 

 below the horizon during the twenty-four hours. 



During many nights there was a halo round 

 the moon, although the stars shone brightly, and 

 the atmosphere appeared otherwise clear. The 

 same phenomenon was observed round the can- 

 dles, even in our bed-rooms ; the diameter of the 

 halo increasing as the observer receded from the 



creasing in the same ratio as that of the atmosphere, at a mean state 



fraction at the upper and lower limbs, increasing- als 

 gives 35' 16" for the horizontal refraction. Temperatii 

 Wind north, a light breeze, a large halo visible 



