450 SECTIONAL TRANSACTIONS.—D. 
light-vessels in this area. Twenty-five of each kind were liberated each week 
at each ship. The resulting information from this experiment shows very 
suggestive relationships with fishery-research problems. 
12. Mr. H. C. Cuapwick.—Ezhibit of Microscope Slides and Lantern 
Slides of Plankton Organisms. 
This exhibit consisted of forty to fifty lantern slides and a few microscope 
slides of plankton organisms. Amongst these were some little-known forms. 
13. Dr. P. L. Kramp.—Meduse in relation to Hydrographic Con- 
ditions. 
Planktologists have frequently called attention to the importance of pelagic 
organisms as indicators of sea-currents, but actually very little advantage has 
been taken of the fact. Mere lists of species, or enumerations of individuals, are 
insufficient. The first) condition for drawing general conclusions from the 
occurrence of the organisms is knowledge of the biological habits of each 
species: distribution, breeding, growth, requirements of hydrographic con- 
ditions, &c. The Danish species of Hydromedusz have been studied from this 
point of view. Faunistically the Danish seas are particularly interesting, because 
they connect an extensive brackish-water area (the Baltic) with the ocean, and 
receive inflows of water of very different origin. If we take into constant 
consideration the life-history, &c., of the snecies, the Medusan fauna becomes 
a great help in tracing the origin of the different bodies of water. The cruise 
of the ‘Dana’ in April-May 1923 serves to illustrate this statement. 
14, Dr. TH. Morrensen.—Observations from the Danish Expedition 
to the Kei Islands, Malay Archipelago, 1922. 
The expedition was undertaken in order to find the best place for the 
establishment of a marine biological laboratory for the study of deep-sea 
organisms. Previous researches (‘ Challenger,’ ‘ Siboga’) suggested the Kei 
Islands as offering unusual advantages, and this was fully confirmed through 
the investigations of the expedition. The sea-bottom round these islands was 
found to form a regular plateau, ca. 2-400 m., affording excellent dredging- 
ground, with a rich, genuine abyssal fauna distributed all over it. The rela- 
tively small depths and the rather high bottom-temperature (10-129 C.) make 
access to the living deep-sea animals exceptionally easy. The shallow-water 
fauna being likewise very rich, health conditions good, communications good 
and regular, the place seems ideal for such a laboratory, which would naturally 
become a central institution for biological investigation of the eastern part of 
the Malay Archipelago (Banda Sea, Arafura Sea, Moluccas, New Guinea). Cost 
of establishing such a laboratory and annual expenses would be relatively small. 
15. Prof. W. J. Daxtn.—The Food of Aquatic Organisms, with 
special reference to the Theory of Piitter. 
16, Dr. Jous. Scumipr.—The Dana Expeditions and their work on 
the Life-History of the Eel. Popular lecture, illustrated by 
lantern slides and cinematograph film. 
Saturday, September 15. 
By the kindness of the Lancashire and Western Sea Fisheries Com- 
mittee there was a whole-day dredging trip on their steamer the ‘ James 
Fletcher.’ 
Monday, September 17. 
17. Prof. F. J. Corn.—The Vascular System of Myzine. 
Three features which are of unique interest in the vascular system of 
Myxinoids are the presence of a heart on the portal vein driving blood to the 
