164 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
sufficient incline to ensure a good current of water passing 
through. Five sets of these boxes were obtained, which 
gives us accommodation for at least 25 millions of cod 
eggs, each box holding with ease 500,000 eggs. In the 
case of plaice eggs 300,000 can be incubated in each box. 
In order to make room for the new apparatus, the 
movable tanks, &c., were removed into the adjoining 
verandah, which had been enclosed and sufficiently hghted, 
and to which an entrance had been made from the tank 
room. A wooden bench running along the whole length 
of the new room was fitted up, on which were placed 
the smaller tanks and other apparatus. This left the 
whole floor of the tank room free for the Dannevig boxes, 
which were placed in position with the necessary supply 
pipes from the filter, a branch being also led into the new 
room. It is usual when hatching operations are going 
_on to have the movable boxes rising slowly and falling 
rapidly once every half minute. This keeps the eggs 
moving and prevents them from gathering together in 
masses on the surface. During the past season no move- 
ment was given, but in future, motion will be used for at 
least some of the boxes. There is still room for some 
additional sets of apparatus, which can be added when we 
have better facilities for collecting the eggs. 
The three wooden tanks, used in previous hatching 
‘work, were also fitted with floating boxes, each box being 
of the same capacity as those of the Dannevig set, but in 
this case there was a separate jet of water to each box, 
the method adopted in America. 
As soon as the whole apparatus was ready for work— 
about the end of January—the crew of the steamer com- 
menced to look out for eggs. They visited the spawning 
grounds and trawled with the steamer’s gear, and also 
boarded the commercial trawlers in order to examine the 
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