38 _ LIVERPOOL BIOLOGICAL SOCIETY. 
tow-net without any light was let down to the same depth 
over the other side of the ship. When the nets were 
being hauled in, as the one with the electric light ap- 
proached the surface numerous small animals (Crustacea 
probably) were noticed. accompanying it, and darting 
about in the bright hight. This tow-net when emptied 
into a glass jar of sea-water was found to contain an 
abundant gathering, consisting mainly of Crustaceans; 
while the net in the dark on the other side of the ship 
had practically nothing. 
The two nets were then put out again. The one had 
the electric light in its former position, but this time 
it was let down to the bottom at a depth of six fathoms ; 
while the other net was placed in the dark at the ship’s 
stern, and also reached the bottom. The tow-nets 
remained stationary, but were kept distended by the 
tide. The outline of the illuminated net could be made 
out indistinctly at a depth of six fathoms. After being 
out for three-quarters of an hour, both nets were hauled 
in, with the same result as before. The illuminated net 
contained abundance of Amphipoda (Ampelisca levigata, 
and Dexamine vedlomensis) and some Cumacea (young 
males of Cuma scorpioides ?), while the dark net again 
contained practically nothing. 
These two experiments showed pretty conclusively the 
effect of the brilliant light in attracting the free-swimming 
animals, the difference between the contents of the two 
nets being on both occasions most marked. Consequently, 
on the second night, in Port Erin Bay, both nets were ~ 
illuminated, and while the one was let down close to the 
bottom at a depth of five fathoms, the other was kept at 
the surface of the sea on the opposite side of the ship. 
This experiment was tried three times, with the same 
result each time: both the nets were found to contain 

