406 ELEMENTARY ZOOLOGY. 



purposely and systematically producing and selecting new 

 and better breeds. The evolution will be correspondingly 

 more rapid. 



All the animal culture mentioned above is done in 

 connection with plant culture and often on the best land 

 the country has. There are other industries which have 

 great possibilities in regions not suited to agriculture. 

 Man has used some of the natural resources of these less 

 used regions in a very prodigal and reckless way. He 

 has not taken pains to look ahead and to act scientifically, 

 simply because he has not been compelled to do so. The 

 time, however, has come when the farmer uses systematic- 

 ally the less productive parts of his farm as well as the 

 more fertile. If not fit for cultivation he uses it for sheep 

 or -goats or something which is best adapted to it. So 

 it must be in the future with the whole earth. The 

 oceans, the rivers, the swamps, the ponds and lakes, the 

 arid regions, and the mountains must be stocked with 

 animals that will contribute to man's food. These ani- 

 mals must be helped to take the place of those which are 

 of no use. This means that the various fishing indus- 

 tries, as mackerel, cod, herring; and even more particu- 

 larly the fresh-water fisheries, as the salmon, whitefish, 

 and other lake and river fish, shall be more than the 

 mere catching and canning of such fish as have been 

 able to fight their own way through to successful matur- 

 ity; they will include the bending of all possible agencies 

 to the building up, improving, and maintaining the 

 numbers and quality of these fish. Oyster, lobster, pearl- 

 mussel, and sponge fishing will be more than merely to 

 put on the market the biggest possible amount regardless 

 of the future ; it will rather be the stocking of all suitable 

 places of the ocean margin that are not more profitably 



