SEA-FISHERIES LABORATORY. 101 



experiments and the other discussing the observations on the 

 periodicity in the abundance of plaice. Mr. Scott has two 

 notes, one on an invasion of the Barrow Channel by 

 Plenrobrachia and Noctiluca, the other on the stomach contents 

 of some mackerel from Port Erin; and finally, with the help 

 of Miss Lewis and Mr. Scott, I give a brief account of the 

 chief plankton phenomena in the Irish Sea during the past 

 year. Both in connection with these plankton investigations 

 and in Dr. Johnstone's observations on the distribution of 

 plaice and other fish, we have a good deal of unpublished 

 material which is still held up until times become more favour- 

 able for printing in extenso. 



I desire in conclusion to record my gratitude to the 

 successive Chairmen, Officials and Members of the Lancashire 

 and Western Sea-Fisheries Committee for the opportunities 

 they have given me for what I hope may be regarded as helpful 

 co-operation during the last thirty years — since the days when 

 my old friend Mr. John Fell, the first Chairman of the Committee 

 invited me to attend an early meeting and give such advice as 

 I could in regard to the scientific principles that form the basis 

 of a rational sea-fisheries administration. 



W. A. HERDMAN. 



Oceanography Department, 

 University of Liverpool, 

 March 26th, 1920. 



