510 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [20] 
seriously interfere with such communication—small wooden boxes are 
used, which are partly filled with stones, and which are placed in the 
basins at some little distance from the faucets (Fig 25). 
, . The faucets are placed 
vin the walls of the large 
\ basins, which are put in 
Fic. 25. communication with the 
small basins by means of a discharge pipe; one or several holes oppo- 
site to that of the discharge pipe serve to prevent the water from flow- 
ing out too freely. 
In Fig. 24, H indicates the place where one of these small boxes is 
located, whilst Fig. 25 gives the profile of the two basins placed one 
within the other. The little fish would have to pass through the entire 
mass of stones before they could reach the stop-cocks. 
In case the rising of the water should fill the basins too much, it will 
become necessary to draw off the surplus water by means of tube L, and 
lead it to some convenient place. 
Figs. 26 and 27 give the elevation and ground plan of these basins 
rising one above the other like steps. The scale is 1 to 600. 
FiG. 26. 
The dotted line indicates that part of the apparatus which is under 
ground. : 
In case the level of the water is not high enough above the ground on 
which the basins are to be constructed, it will become necessary to lead 
the water, by means of pumps or other contrivances, into a common 
reservoir destined to feed the entire establishment. The basin B can 
very well be replaced by a filter placed in the common reservoir. 
Itis probably not necessary to demonstrate that the young fish should 
be fed as nearly as possible in the same way as they would feed if they 
were entirely free. 
We therefore think | 
itadvisable to plant 
someaquatic plants | 
in the basins where = 
those fish are which } 
feed on plants and 
insects; they ought 
also to have all the Neo Ee 
worms and larvze that can be procured, as well as insects of the species 
Cyclops, Cypris, and Cythera, which in spring are plentiful in fresh 
water; boiled peas, hemp cakes, bread, &e., may also be given to them. 
