PROPAGATION OF FISH. 249 



is asserted that the 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 unlimited extent. 

 That in case aquatic vegetation makes its appearance, 

 the eggs can be transferred to a clean hurdle. 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 effect. 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 fall, when it is dipped 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* 



