SEA-FISHERIES LABORATORY. 943 
Meee NSIVE STUDY OF THE MARINE 
PLANKTON AROUND THE SOUTH END OF 
Ta isle OF MAN. PART TI. 
By W. A. Herpman, F.R.S., and Anprew Scorr, A.L.S. 
| Inrropucrory Nore.—During the past year (1908) 
the plankton work described in the last report 
has been carried out on very much the same 
lines sas in 1907, with the double object (1) of 
_ studying the distribution of the plankton as a whole 
and of its various constituents, and (2) of attempting to 
arrive at some estimate of the representative value of 
samples. During the year as a whole ordinary tow-net 
gatherings have been taken at approximately weekly 
intervals from a small boat in Port Erin Bay, the practice 
being to make a traverse of the bay, across its middle, 
from the hfeboat slip on the south side to the rocks of the 
opposite shore. The nets used were ordinary open tow-nets 
of 144-inch diameter at the mouth, and made of Dufour’s 
No. 20 silk bolting cloth. These gatherings were fixed 
and bottled by Mr. Chadwick at the Biological Station 
and were sent periodically to Mr. Andrew Scott for 
examination. For about a month at Easter (practically 
the month of April) and for two months in summer 
(practically August and September) Professor Herdman 
made more frequent and more extensive collections from 
the yacht “ Ladybird,” both in the bay and also at sea. 
In this work he was assisted at Haster by Mr. W. Riddell, 
M.A., of Queen’s College, Belfast, and in summer by Mr. 
Harold Drew, B.A., of Christ’s College, Cambridge, and 
now Lecturer in Biology at the Plymouth Technical 
School. Both Mr. Riddell and Mr. Drew took part in the 
