STOCKHOLM, 1899. 105 



Observations on transparency and colour of the water should be 

 made at the points mentioned in ii. 



Opportunities should be afforded to bacteriological institutions to 

 carry out investigations in the ocean. 



VII. 



Observations on currents and tides should be carried out as frequently 

 as the circumstances allow. 



The currents should be examined, when possible, by direct current- 

 meters and by surface and intermediate floats and by bottom-rollers. 



The ship should be anchored occasionally in order to make frequent 

 observations during a complete period of tide. 



viii. 



It is desirable that a chart should be prepared of the bottom of the 

 seas examined, showing the nature of the sea-bottom. 



The description of the deposits is to be carried out on a definite plan, 

 to be afterwards settled. (See Appendix III.) 



IX. 



The normal observations are to be carried out along the lines pro- 

 visionally drawn on the annexed chart, where B denotes the Eussian, 

 F the Finnish, S the Swedish, G the German, Da the Danish, Die the 

 Dutch, N the Norwegian, and B the British lines. 



The special points are to be decided by the respective nations, and 

 when once chosen the subsequent observations are to be repeated at 

 the same points. 



The particular instructions for the stations will be given by the 

 respective nations, and the communications as to the extent and the 

 nature of the observations shall take place through the central bureau. 

 (See C, a and e.) 



It is desirable, in carrying out these investigations, to make use of 

 regular liners, light-ships, etc., and coast stations for the purpose of 

 taking temperature-observations and collecting samples of sea-water 

 and plankton. 



These observations are to be taken not only in the typical months 

 but also during the intervening periods. 



