INTRODUCTION 
Sie the first part of this publication was issued I have studied the marine 
Algæ on the Danish coasts almost every summer. During the last two years my in- 
vestigations have been more extensive. This is chiefly due to the addition made to 
the area of the Danish flora in consequence of the reunion of North Slesvig with 
Denmark in 1920. The boundary on the eastern side of Slesvig having been remoyed 
from Heilsminde to Krusaa in the interior of Flensborg Fiord, the Little Belt area 
(Lb) has been augmented by the waters between Heilsminde in the north, and Sonder- 
borg and Pol at the south-eastern extremity of Als, while the line bounding the Da- 
nish part of the Baltic (Bw) on the south must now be drawn from Krusaa through 
the middle of Flensborg Fiord and thence south of Bredgrund south of Als. Though 
these waters have formerly been examined by Professor REINKE, and their flora and 
vegetation dealt with in his well-known work Algenflora der westlichen Ostsee Deut- 
schen Anteils, 1889, I have considered it necessary to study the same waters myself. 
By the kindness of the fisheries director, Mr. F. V. MortTENSEN,-I have been enabled, 
with the assistance of the fishery control motor-boat, to make investigations and 
collections in the waters round Sonderborg in June 1921, and in June 1922 to make 
similar investigations while onboard the control steamer S. S. Falken (fisheries super- 
visor TROLLE THOMSEN), along the entire eastern coast of South Jutland and likewise 
in the waters surrounding Funen. In both cases the material was collected partly, 
by means of a boat, from stone reefs and in other localities such as breakwaters 
near land, partly by dredgings from ship at a greater distance from land. In the 
autumn of 1922 there further occurred an exceptional opportunity to make dredgings 
in the North Sea and the Skagerak in places otherwise very difficult of access, since 
the marine research ship S.S. Dana was to make fishery investigations in these 
waters, and especially in places where one might expect to find Algæ. The Marine 
Research Committee very readily granted me room onboard, and the leader of the 
cruise, Dr. A. C. JOHANSEN, did everything in his power to further my investigations. 
As I was obliged to break off my stay onboard on October 7th, mag. se. Mr. C. A. 
JORGENSEN was deputed to carry on my investigations of the flora of the Skagerak 
and the northern and central parts of the Kattegat until the cruise came to an end 
on October 19th. Mag. JORGENSEN has later, in June 1923, made investigations onboard 
the Dana in the waters around Bornholm and left the collected Algze at my disposal. 
omk 
ol 
