COUNCIL -JULY 1902 — APPENDIXES 



Annexe C 



Program for Plankton-collecting 



Proposal of P. T. Cleve and G. H. Ostenfeld 



1) Samples of plankton are to be collected at every hydrographical station at 

 the surface and from every different hydrographical layer, provisionally determined 

 by the temperature. 



2) Samples of plankton are of two kinds viz. a) microplankton, collected 

 by means of nets of gauze no. 20 and b) macroplankton, collected by egg-nets of 

 gauze no. 3. 



a) As a net Apstein's large model with Petersen's closing apparatus, opening 

 0,1 m. in diameter, is to be used for vertical hauls; but for surface-samples 

 a townet, 0,9 m. diameter, of the same kind of gauze, which townet is to be 

 slowly hauled near the surface during 15 minutes. 



b) For collecting macroplankton, the egg-net is to be kept at the surface, 

 in such a manner that Va or Vs is above the level; time 15 minutes. For 

 collecting samples from deeper layers the egg-net may be hauled slowly through 

 every different layer, as indicated in 1), to the surface. 



3) The microplankton is to be preserved in alcohol, and the macroplankton 

 in seawater with 5 "/o formol. 



4) The macroplankton is to be measured in a cylinder graduated in cent, 

 cub. diameter 2 cm.; then the fish eggs and larvae of more than 5 mm. in length 

 are to be separated and preserved in special tubes, for examination by specialists. 



5) The volume of microplankton is also to be measured, after it has settled 

 for one week and notice is to be taken whether it consists chiefly of diatoms, of 

 cilioflagellates or of animals. 



