SEA-FISHERIES LABORATORY. 139 
they were laid down. No more than about 18 hours elapsed 
in any case between the collection of the sample and its analysis. 
Samples were also sent from each place after 48 hours 
relaying, and in the case of the Crook Skear site an additional 
sample was sent after 11 days. 
The places (2) and (3) were unsatisfactory. This is un- 
fortunate, since they were very near to the railway station, 
and, on that account were favoured by the men. The relaid 
mussels, after 48 hours, were more highly contaminated 
than the original un-relaid mussels. These results are anomalous, 
and are partly due to the exceptional floods in the river, 
and partly to other causes as yet suspected only. 
The place at Crook Skear was satisfactory. There is a 
little shallow pool on the shore here, which fills at about half- 
tide. Samples of water were taken from this pool and from 
the adjacent channel near the level of low water. The results 
of analysis were :—- 
The water in the pool ... 0 intestinal organisms per c.c. 
The water in the channel 40 Ly s is 
An experimental relaying gave the following results :— 
Original uncleaned sample 5,200 intestinal organisms per mussel. 
Relaid for 48 hours _...._ 416 A x » 
Relaid for 11 days peel 2) is > 25 
There is, of course, little real difference between the 
mussels relaid for 2 days and those relaid for 11 days. I regarded 
this experiment as satisfactory. 
Several men fish the Skears near the Abbey Light, and 
relay their mussels on the foreshore at Plover Point, near 
Cockersand Abbey. Samples of these mussels were sent to 
me and examined: they contained about 500 intestinal 
organisms per mussel. Samples were also sent to Professor 
Delepine, of Manchester University, who found B. colt in 
1/1,000th, but not in 1/10,000th part of a mussel. These 
