MILLPORT MARINE BIOLOGICAL STATION. A 
ence of a hook and the subsequent ordeal of being landed, 
handled, and brought into the aquaria. Besides which, fish do 
not learn readily from a single experience; for example, Day 
records a Perch being taken with its own eye as bait,* and many 
similar instances are known. Piket or other fishes take a long 
time and many knocks to realize a glass division across the tank 
in which they live. Fish, if hungry, will repeatedly try inedible 
or nauseous objects before finally refusing them; I have watched 
wild 3-spined Sticklebacks take bits of water-logged wood, &c., 
several times before giving them up. In experiments on feeding 
captive fish with Nudibranchs at Port Erin { and elsewhere, it 
was found that the same fish would try distasteful things time 
and time again. I have found the egg-masses of Loligo parti- 
cularly distasteful to fishes. In experiments of this kind with 
tame fish, it is necessary to make considerable allowance for the - 
fact that they feed by sight, and have learnt to take everything 
that is thrown in to them; because, after several weeks in the 
tanks they learn to recognize the action of putting food into the 
water, and can even associate the probability of food with the 
presence of a tray in one’s hand, so that one has only to appear 
with the food-tray and the fish all come towards one, move about 
excitedly, knocking their noses against the glass, and making 
snapping movements with their jaws. If they are very hungry, 
they will behave similarly when one is only passing the front of 
the tank. Later they can associate the presence of somebody 
working by the mussel-tank, at the opposite side of the tank- 
room, with the probable occurrence of feeding, and one has only 
to go there for a few minutes for them to show their usual 
interest in what one is doing. By this time some of the fish 
will come up to the surface of the tank when anyone of those 
who usually feeds them gets up to regulate the circulation of the 
water, and will feed from one’s hand or bite one’s fingers. Some 
of them become so tame that they will come to one’s hand, 
apparently without desiring or expecting food, and lie in it, 
particularly if tickled or stroked gently. An easy method of 
removing tame Saithe from a shallow tank is by “‘ guddling,”’ 
* ‘Wishes of Great Britain and Ireland,’ by IF. Day, vol. i. p. 5. 
+ ‘ Mind under Water,’ by R. Jeffries. 
| ‘ Fauna of Liverpool Bay,’ Report ii., pp. 150-163. 
Zool. 4th ser. vol. XVI., January, 1912. c 
