ae) FORESTRY OF NORWAY. 
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. wiuter-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 
A.M. 
During summer, on the contrary, the diurnal variation 
1g proportionally very great in the eastern part of the 
country, where it amounts to 1:22 mm., while on the west 
coast it is very little, amounting to 0°27 mm. only. The 
maximum occurs at Christiania at 7 AM., at Bergen at 
