ETEOROLOGICAL observations are as a rule taken on all arctic 
M expeditions, as it may be very interesting for the expedition itself 
to obtain numerical expressions for the meteorological conditions under 
which it has worked in order to reach its goal. It may also be of great 
value to another expedition, sent out some time in the future to 
the same locality, to know the meteorological conditions which a pre- 
ceding expedition had to compete with, and the manner in which it 
has been possible for it to surmount the difficulties caused by the weather 
conditions. 
The meteorological observations collected on arctic expeditions are 
however also of great value for meteorological science in general, if 
gathered in such a manner that they — when researches over the atmo- 
spherical conditions and changes over large areas are to be made — can 
be worked into the observations taken in the same interval at the per- 
manent meteorological stations in the surrounding net. 
For such researches the observations taken on arctic expeditions 
can be of exceedingly great value, as the material as a rule is gathered 
in a locality, where there is a gap in the net of meteorological stations. 
The observations can furthermore give some valuable information 
as to the knowledge of the climate in these out-of-the-way localities, 
but it must be remembered that the changes in the meteorological 
elements are large in the arctic regions, wherefore it is necessary to have 
observations which cover a large span of years in order to find even 
approximately correct means and extremes. 
The observations from the North-east coast of Greenland can be 
of particular value for the construction of isobarmaps over the North- 
Atlantic Ocean. 
This is illustrated on figs. 2—10, which show some isobarmaps, 
constructed on basis of observations from the permanent meteorologi- 
cal stations on Greenland, Iceland, Norway and Sweden, all worked to- 
gether with the observations taken at the headquarters of the “Alaba- 
ma Expedition” on Shannon Island. The distance from Shannon Island 
to the nearest permanent station (fig. 1) is about 1000 kilometers. 
