108 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
* 
Man, and this work is incorporated in our joint paper on 
“Tntensive Study of the Plankton ’”’—Part II of which 
will be found further on in this report. 
WorK AT THE LIVERPOOL LABORATORY. 
Mr. Johnstone’s work scarcely requires to have special 
attention drawn to it, as it is in the main a continuation 
of his previous work on fish parasites, on marked fish, and 
on various bacteriological investigations. I may say, 
however, that there are two unusually important matters 
which have engaged our special attention in the Liverpool 
laboratory during the past few months, namely :—-(1) the 
results of the hydrographic cruises, which lead us to the 
conclusion that some modification of the lines of observing 
stations will give increased knowledge in the future; and 
(2) the urgent question of sewage pollution of the shellfish 
beds, and especially of the mussels at Conway. Both 
these subjects are dealt with fully in the articles that 
follow—by Dr. Bassett on the hydrographic work and by 
Mr. Johnstone on the bacteriological investigations. It 
is eminently desirable, in the interests both of the local 
fishing industry and of the general public health, that the 
experiments we have recently made in re-laying polluted 
mussels on the Conway shore be followed by the construc- 
tion of a model cleansing pond somewhat on the plan of 
those known as basins of “ dégorgement ”’ in connection 
with oyster culture on the coasts of France. 
From another of Mr. Johnstone’s Reports, given 
below, it will be seen that he has been continuing his 
important experiments in the marking of fish, with the 
view of getting information as to migrations and rate of 
erowth; and, as an extension of the same subject, he is 
now carrying out further work bearing upon the 
statistical investigation of the local Plaice fisheries by 
