COUNCIL — APRIL 1912 — APPENDIX C — 58 — 



Prof. S0RENSEN gave a lecture on the concentration of H-ions, and demon- 

 strated the method of determination. 



van Everdingen thanked him on behalf of the meeting. 



Fifth Sitting: Wednesday, 24th April 1912, at 5 p. m. 



Chairman: Docent Knudsen. 



Secretary: Dr. Gehrke. 



Also present: van Everdingen, Green, Schultze, Witting. 



The sub-committee laid before the meeting a proposal as to the organisation 

 of continuai hydrographical observations in the Baltic and the Cattegat. The Section 

 recommended that continual observations of current, temperature and salinity 

 should be carried out from lightships all the year round (Resolution No. 6), the 

 work to consist of: 



1) Measurements of current 3 to 6 times daily, at the surface and at two 

 intermediate depths, noting at the same time direction and force of wind. 



2) Observations of temperature, and samples for titrimetrical determination 

 of salinity to be taken at the surface and at two (or more) depths 3 to 4 times 

 a month. 



3) The following places were mentioned as specially suitable for such 

 observations: Norströmsgrund, Westra Banken, Revalstein, Nekmangrund, Libauer, 

 Almagrund, Adlergrund, Fehmarnbelt, Schultz's Grund, Anholt Knob, Fladen. 



The question of determining the H-ions concentration in sea water was 

 touched upon, and it was pointed out that the obtaining of standard solutions and 

 standard apparatus was greatly desired. It was agreed (Resolution No. 7) that 

 the Bureau be requested to determine whether this could not be done with the 

 assistance of the Carlsberg Laboratory. 



The sitting closed at 6.30 p. m. 



Sixth Sitting: Thursday, 25th April 1912, at 10.10 a. m. 



Chairman: Docent Knudsen. 



Secretary : Dr. Gehrke. 



Also present: van Everdingen, Jacobsen, Jee, Schultze. 



Later : Witting. 



Docent Knudsen read resolutions 1 to 7. 

 The resolutions were passed. 



