128 



bulletin: museum of comparative zoology. 



^ith the vessel travelling at such a speed that the wire rope made an 

 ande of about 60°, the same weight (seventy pounds) bemg invariably 

 used The catch was placed in jars, killed with formalin, and allowed 

 to settle, usually over night, and then measured for bulk. The Hensen 

 net hauls were preserved entire in formalm, and measured for bulk 

 at Cambridge, being allowed to settle before measurement, until no 

 Lhe" visible shrinkage took place. The data of the quantitative 

 hauls are: — 



Station 



2 



4 



7 



8 

 11 

 15 

 21 

 22 

 25 

 28 

 31 

 35 

 36 

 38 

 43 



Vol. c. c. 

 25 

 5 



6.5 

 5± 

 2 

 1 

 1 

 3 

 8 

 3 

 3 

 only a trace 

 3 

 2 

 1.5 



Relative no. of copepods 

 239 

 104 



471 



30 

 11 



97 

 125 



25 



20 

 trace 



50 



24 



15 



To obtain the number of copepods, the mass was diluted to 150 cc, 

 well n^xed, and while the plankton was in suspension three cc. taken 

 bv a pipette and counted: most of them were tried twice and the 

 resuUs averaged. The total number of copepods in each haul is not 

 g^en but?an be easily obtained by a simple calculation. Most of 

 tVipm are Calanus finmarchicus. , . . ,i e 



TheTolumes of the four-toot qualitative hauls (om.tfng the surface 

 hauls made with this net), in hundreds ot cub.c centimetres, are: - 



Station 



4 



6 



7 



8 

 11 

 12 



Volume 



19 



19 

 9.5 

 9.5 

 4.7 

 9.5 



Station 

 25 

 27 

 28 

 29 

 31 

 33 



Volume 

 3 



4.7 

 8 



2.5 

 3 

 less than 1 



