COUNCIL -MARCH 1920 -RESOLUTIONS — 32 — 



Resolution 13. 



It is recommended that the study of the inflow and outflow of water through the Belts, 

 Cattegat and Skagerak be quantitatively examined. 



Resolution 14. 



It is recommended that the mechanics of the interchange of heat between the atmosphere 

 and the hydrosphere should be investigated and that special attention should be given to the 

 phenomenon of evaporation. 



Resolution 15. 



For the study of the residual currents in the sea it is necessary to have very accurate 

 knowledge of the tidal movements. It is therefore recommended that there shall be a sufficient 

 number of tidal gauges established from which reliable data can be obtained, and the results be 

 co-ordinated by some central office. 



Plankton The plankton section does not recommend a formal programme of investigations 



Committee to be carried out by all countries for the year 1920 — 21 as sufficient equipment and staff 



are not available. 



The section recommends the general ideas proj)osed by Professor Stanley Gardi- 

 ner and wishes especially to urge the importance of the following points. 



Resolution 16. 



Investigations should be carried out to determine how far the variations in the content 

 of dissolved oxygen and of hydrogen ion concentration of sea water can be used as a measure 

 for the photosynthesis and production of organic matter in the sea, and to what extent the 

 same factors influence the animal life. 



It is desirable that investigations as outlined above should be carried out during the 

 EngUsh plaice egg investigations and also during a short period subsequently. 



It is also desirable that a similar investigation should be , carried out from the 

 Norwegian coast during the spawning period of the herring and in the subsequent month. 



Resolution 17. 



It is of great importance that investigations should be commenced in order to determine 

 the quantity of organic matter present in solution in sea water and the importance qf this to 

 vegetable and animal life. 



Resolution 18. 



It is recommended that investigations on the life-cycle of the larger species of copepods 

 and other planktonic Crustacea be carried out. 



