59 



bers as in the autumin, there are no immense falls at the 

 "lights". They prefer to fly with directions of wind in the 

 3rd quadrant, chiefly with winds from S. W. Most of the falls 

 have taken place by the forces of wind 2 — 3 — 4 (Beauforts scale), 

 a few falls in storms. During the spring-migration there is a 

 particular migratory direction over the country coming from S.W. 

 towards N. E. An important route of passing seems to go from 

 the south-western corner of the country across the northern 

 part of the Kattegat. A special migration over the Baltic un- 

 touched by the other migrations over Denmark strikes the 

 lightwessel of Gedser Reef. The isle of Bornholm has but little 

 migration. 



The migration is not of equal strength every spring, years 

 with only few falls at the "lights" succeed years with a great 

 many falls. No particular part of the country shows migration 

 earlier than others. Male birds as a rule migrate earlier than 

 females. 



The autumnal-migration begins in October, however only 

 slightly in the first part of the month, culminating in the days 

 about the 27th and going on with importance to the middle of 

 november being nearly over by this time. Far more birds pass 

 the country on this westward migration. Evidently these are 

 birds coming from the Kast, from Finland and Russia, birds 

 w^hich on the spring-migration have passed other regions than 

 Denmark. Consequently the direction of the entire autumn- 

 migration is more east-western, whereas that of the spring was 

 Southwest — northeast. The birds often migrate in immense num- 

 bers, and the weather being so that they are forced against the 

 "lights", there may in a single night be killed up to several 

 thousands of birds at a single light-wessel. No particular road 

 of passing over the country is prevalent, but still the migration is 

 most lively across southern Kattegat and southern Denmark. 

 Migration over northern Kattegat is somewhat scarce; birds 

 migrating here evidently pass the "lights" ^ on the northern 

 westcoast of Jutland. Vyl, Horns Reef and Blaavands Huk 

 seem to have a particularly abundant passing. Also now the 

 light-vessel at Gedser Reef is struck by a lively Baltic-migration. 



The birds preferably migrate with directions of winds in the 

 2ncl quadrant, (chiefly E. S. E. and S. E.). 



The migration of the male birds mainly coincides with 



