42& FORESTRY OF 



pressure, enclosing at Iceland a zone wherein it is the 

 lowest of all ; but the Scandinavian peninsula occasions a 

 little disturbance of the regularity of its distribution. 



In summer the distribution of pressure is almost the 

 contrary of what it is in winter. Along the axis of the 

 peninsula, from the central mountain mass of the Dovre- 

 fjeld to the North Cape, there exists a region in which it is 

 comparatively low, with an isobaric line of 655 mm., and. 

 parallel to this are other isobaric lines following the direc- 

 tion of the coast, so that, in the central portion of the 

 peninsula, there is in summer a minimum of pressure 

 begirt by a greater pressure along the coasts. 



The isobaric lines for the winter and for the year are 

 remarkably accordant with those of the anomalous ther- 

 mometric distribution, great excess of heat corresponding 

 with a feeble pressure of air, and vice versa. In summer 

 the same thing is observable, but it is less striking. 



In the annual variations there are some small inequali- 

 ties which do not disappear under protracted observation. 

 But saving these exceptions, over the whole of Norway the 

 greatest pressure is in the month of May. The lowest 

 pressure is seen on the west coast during the months of 

 winter. At the Skagerack it is seen in spring and summer, 

 in the eastern part of the country in July. This variation 

 is least in the east, where it is 3'5 or 4 mm. ; it increases 

 towards the west, till at Hammerfest it has attained to 

 11 mm. This variation is mainly a consequence of the 

 lower pressure in winter. 



The diurnal variation during winter is pretty uniform 

 in the eastern and western parts, with a maximum of 4 mm., 

 the maximum occurring at Christiania before mid-day, at 

 Bergen at noon ; the minimum occurs between 2 and 4 



AM. 



During summer, on the contrary, the diurnal variation 

 is proportionally very great in the eastern part of the 

 country, where it amounts to T22 mm., while on the west 

 coast it is very little, amounting to 0*27 mm. only. The 

 maximum occurs at Ghristiania at 7 A.M., at Bergen at 



