COUNCIL — SEPTEMBER 1922 — 26 — 



Recommendations of the Plankton Section. 



1. Since the various countries are able to examine only a limited number of plankton 

 samples it is not considered practical to arrange any definite programme of 

 work. The available workers will be fully occupied in dealing with samples 

 collected in connection with definite fishery problems such as for example, 

 the investigations into the food of the herring. 



2. With reference to the standard net proposed in resolution (1) of last year it 

 has been decided that: — 



a) In the interest of economy the length of filtering surface shall be 2 metres 

 instead of 3. 



b) The coarse and fine meshed nets shall be manufactured of silk similar to 

 that made by Messrs. Albert Wyoler of Zürich. 



Fine mesh no. 25, 77 strands in 10 mm. 

 Coarse mesh no. 3, 23 strands in 10 mm. 



c) The net shall be used with a bucket of which a description will be circulated. 



d) A complete specification of the net will be circulated at an early date. 



3. With a view to the formation of a central type collection of plankton organisms 

 at some future date each country is requested to prepare before next meeting 

 a list of those types that they could supply. 



4. Attention is drawn to the unsatisfactory state of our knowledge as to the range 

 of variation in the plankton and it is hoped that this important problem will 

 be kept in view. 



5. With the above modifications the resolutions passed last year are confirmed. 



Programme of the Hydrographlcal Section. 



I. The Section highly estimates the value of the hydrographlcal investigations, 

 which Director Chaves has carried out in the waters at the Azores in the 

 years before the war. And the Section warmly recommends that a ship be 

 again placed at the disposal of M. Chaves by the Portuguese Government, 

 so that he may be able to recommence his investigations as soon as possible. 

 II. The Section is of the opinion, that hydrographlcal investigations along lines 

 from Lisbon to the Azores, and from Cape St. Vincent to the coast of Mo- 

 rocco, will be very valuable. And the Section recommends that such invest- 

 igations be carried out by the Marine Department of the Portuguese Govern- 

 ment. 



