PROPAGATION OF FISH. 249 
is asserted that tlie same water may be used over and 
over again if filtered, and that it may be allowed to 
pass from one box to another to an nnlimited extent. 
That in case aquatic vegetation makes its appearance, 
the eggs can be transferred to a clean hnrdle. The 
reader is solemnly warned against heaping up the eggs 
upon one another, a fault entirely inexcusable consider- 
ing the small space they occupy, and a good food is sug- 
gested in the fecundated eggs and consequent young of 
other species. 
The transportation of fish is one of the most important 
subjects that presents itself, and with full grown trout 
is one of the most difficult to efi'ect. But the impreg- 
nated eggs can be carried with care for hundreds or 
thousands of miles with little loss and no inconvenience. 
The best and healthiest looking spawn must be selected, 
and if it can be left for a few days to mature after 
impregnation, so much the better ; it may be deposited 
upon sand or the leaves of plants found in the waters it 
frequents, placed in a wooden or tin box, and covered 
with similar leaves or sand, upon which another layer of 
eggs and leaves or sand can be placed, and so on till the 
box is full, when it is dip]3ed in water and thoroughly 
saturated. The lid is put on to prevent any motion of 
the contents, and it can be carried almost any distance 
if it is occasionally dipped in water at a low but not a 
freezing temperature. Upon arriving at its destination, 
the contents are poured out carefully, and the eggs 
hatched in the ordinary way. 
Young trout a few months old can be transported with 
facility in water cooled with ice. For travelling by rail- 
11* 
