THE SUN-PERCH AND THE CATFISH 



and the nature of the nutritive equilibrium, and make 

 our stocking proportionate thereto. Before attempting 

 to acclimatize a foreign species, we must consider its 

 mode of life in its native country, and make a trial before 

 giving it full liberty. Here, as in everything else, the 

 sound method consists in thinking out things in advance, 

 so as to make the best use of the material at our disposal." 



207 



