THE NEW AKT OF BREEDING FISH. 105 



low the course of the stream, which will draw them 

 to the meadow by the extremity of the glass-house 

 through which the current passes, and leave them in 

 the basin. There they will grovr ; but their number 

 increasing every day, they cannot be long kept in 

 this narrow reservoir. Larger basins then must be 

 provided, where they can grow with proper nourish- 

 ment. The dependencies of the Rhine and Rhone 

 Canal will fulfil this office, and on a scale so vast, 

 that there will be a crop greater than one would sup- 

 pose room could there be found for. Thus : — The 

 government has on the borders of the canal, on the 

 right and left, — land in length 117,7.30 metres, and 

 breadth 15 metres. Already there they have dug a 

 certain number of ponds, well supplied with water. 

 These ponds may be multiplied indefinitely, and con- 

 nected by gratings, so as to prevent the admixture 

 of the different kinds of fish, and stopped off occa- 

 sionally in order to admit of being severally emptied, 

 so that the young fish can be taken from them. But 

 the ponds already dug on one side of the canal are in 

 the same part of the meadow with the receiving ba- 

 sins, into each of which the hatching trenches will 

 carry a particular species ; and it results from this, 

 that to transfer the young of this species from the 

 establishment where they were hatched to the ponds 

 where they are to be converted into larger growths, 

 there is almost nothing to do. The operation will be 

 self-accomplished, so to speak ; and from the single 



5* 



