108 flow to obtain tt. 
In the case of a lake or river in which it is intended to keep 
up the stock of trout by a periodical planting of fry, it is of 
importance to have nurseries prepared for them, and these require 
to be properly made, or they may be worse than useless. Their 
construction is often a very easy matter. A series of long narrow 
ponds of the simplest description will do, and a couple of good 
men should make enough of these in a few days to stock a lake 
of twenty or thirty acres. In the case of large lakes it is desirable 
to have a larger series of these nurseries, and sometimes, in that 
of more extensive waters, it is an advantage to have them at 
several places. Once made they require little work to keep them 
up, and can be used year after year with excellent results. Some 
lakes are fed by streams flowing a considerable distance through 
flat marshes or meadows. In such a case it is desirable to go 
further away, until a place is reached where the water has a slight 
fall. It matters little about distance, it may be a hundred yards, 
or it may be half-a-mile. In the latter case the little fish will 
easily find their way down stream. When the site has been 
chosen, make a long raceway or aqueduct with alternate stretches 
of deep and shallow water. It does not matter about the wide 
and narrow stretches being symmetrical at all; they will have to 
be made to suit the level of the ground and surrounding 
circumstances. It may be necessary to have them longer or 
shorter, but where practicable, from forty to sixty feet will be 
found a convenient length for the wider and deeper parts, and if 
carried out somewhat according to the accompanying plan the 
raceways will be a little longer of the two. 
Let AA represent the stream supplying the pond E. At the 
point B cut a raceway eighteen inches wide and a foot deep. Dig 
out some ponds CCC two and a half feet deep by three and a 
half feet wide, and connect them by raceways DD, of the same 
width and depth as B. Where sufficient fall can be obtained, 
each of these ponds or nurseries should have a bottom outlet at 
the most convenient point, so that they can be run dry at any 
time if desired. A four-inch pipe answers best for this. A 
screen should be placed at the point B to prevent larger fish 
coming down, and another between D and E, which will allow 
fry to pass down into the lake E, but will prevent larger fish 
