38 



H. MOHN. 



M.-N. Kl. 



Halos 

 are most frequently seen round the Moon, 20 times, and only twice round 

 the Sun. 



Wind and change of pressure. 

 From the wind-tables and the barograms I have taken out the change 

 of pressure during 4 hours for each wind-direction, and computed the 

 weighted means for the ten months. 



Number of cases. 



Amount of change in 4 hours, mm. 



Probability of change. Per cent. 



The single months show the same character as the means for 10 

 months. 



The probability of rising pressure is greatest for N and least for 

 SE; and the probability for falling pressure is greatest for SE and least 

 for N. The amount of change is greatest for NW. The pressure may 

 rise and fall with any direction of wind. The gradients may point in 

 any direction or »Highs« and »Lows« may be found all round Fram- 

 heim. The rising and falling of the pressure indicate that high and low 

 pressures are approaching, or retreating from, or passing Framheim in 

 £very direction. 



SE wind with its maximum of probability of falling pressure, indi- 

 -cates »Lows« in the NE quadrant approaching Framheim, and North wind 



