SUMMER PLANKTON FKOM WEST COAST OF SCOTLAlfD AKD THE IRISH SEA. 



23 



A Comparison of the Summer Plankton on the West Coast of Scotland with 

 that in the Irish Sea. By Prof. W. A. Herdman, D.Sc, F.R.S., F.L.S. 



[Eead 3rd November, 1910.] 



During the last fom- summers (1907-1910, inch) I have spent the first 

 few weeks (July) of the vacation in taking plankton hauls from the 



Fig. 1. — "Nansen" Closing Tow-net 

 in action, 



I. Open, as it descends and as it 

 fishes. 



II. Closed, as it is hauled in after 

 fishing. 



M, messenger to effect closing ; 



L, releasing apparatus ; 



T, throttling noose ; 



C, canvas front to net ; 



B, brass bucket containing the catch ; 

 W, weight. 



I. II, 



S.Y. ' Ladybird ' amongst the islands and sea lochs of the west of Scotland, 

 and the remainder of the time (in August and September) in similar work 



