40 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
California, and other visitors of high authority, haye 
expressed appreciation of our hatching and rearing 
arrangements, and have represented to us that it would 
be very convenient to themselves and others to have 
published in our report a detailed description of the 
Hatchery and hatching boxes, with figures of the 
mechanism by which the water is kept in motion, that 
could be quoted or referred to by others wanting informa- 
tion or writing on such matters. Consequently I have 
asked Mr. Chadwick to supply me with the measurements 
and drawings, from which the following account of the 
Hatchery and its apparatus has been drawn up :— 
The hatchery room measures 30x 254 feet, with a 
height of 10 feet. The concrete floor slopes shghtly from 
the front and the back of the room to the centre, where 
there is a shallow gutter for waste water 6 inches wide. 
At the west end of the room this gutter branches at right 
angles to right and left, and each branch opens into a 
bowl-shaped depression 2 feet in diameter. From the 
depression on the north side of the room a deeper waste 
cutter runs straight through the west wall to open over a 
grid outside the building. A narrow groove in the floor, 
designed to receive the waste pipe connected with the 
hatching tanks, opens into each depression (fig. 7). 
The ceiling is of varnished pine, and the room is 
lighted by six windows facing north and four facing west. 
The entrance from the Aquarium is on the east wall. At 
the opposite end of the room a door leads outwards to the 
path surrounding the spawning pond. On the south side 
of the room there is a double door opening into a wide 
passage leading past the engine room to the back yard. 
Space for four additional hatching tanks is still vacant 
along the south wall, the remaining space being occupied 
by a deep concrete (lobster) tank, built on the floor and 
