SEA-FLSllERfEK LABORATORY. 



193 



The fixed stations at which observations were generally 

 made are shown in the adjoining plan (fig. 1), where I 

 and II indicate off-shore stations, respectively five and 

 ten miles from land ; and III, IV and V show the along- 

 shore stations, one to the north towards Niarbyl, one to 

 the south near the Calf Island, and one in the " southern 

 sea " off Spanish Head — all, except II, in water of much 

 the same depth, about 20 fathoms. The region covered 

 measures about ten miles from east to west (out to sea) and 

 rather less from north to south (along the coast), but the 

 area investigated was really very much less, being 

 confined to the above-mentioned stations from which 

 plankton samples were taken and the in-shore waters of 

 the Bay. 



Fig. 1.— Plankton Stations off Port Erin. 



The usual practice, in our work on the yacht, was 

 this: — At each station, after taking the bearings, depth, 

 &c, we first lowered two vertical nets, the Petersen- 

 Hensen and the Nansen, to a depth of 20 fathoms, pulled 

 them up slowly through 10 fathoms, and then closed them 

 by " messengers " run down the line. This gave us 



