...clothing, and build better houses ; and the necessity of doing this will react upon his mental organisation and social condition — will advance them while his...extinction. He domesticates animals which serve him either to capture food or for food itself, and thus changes of any great extent in his teeth or digestive...

...however, it is probable that this cannot be done. The internal organs may not vary quick enough, and theu the animal will decrease in numbers and finally become...supply independent of the accidents of varying seasons and natural extinction. He domesticates animals which serve him either to capture food or for food...

...clothing, and build better houses; and the necessity for doing this will react upon his mental organisation and social condition — will advance them while his...extinction. He domesticates animals which serve him either to capture food or for food itself, and thus changes of any great extent hi his teeth or digestive...

...and the necessity of doing this will react upon his mental organization and social condition—will advance them while his natural body .remains naked...extinction. He domesticates animals, which serve him either to capture food or for food itself, and thus, changes of any great extent in his teeth or digestive...

...the race into harmony with its new food. In many cases, however, it is probable that this can>. not be done. The internal organs may not vary quick enough,...extinction. He domesticates animals, which serve him either to capture food or for food itself, and thus, changes of any great extent in his teeth or digestive...

...while his natural body remains naked as before. When the accustomed food of some animal becomes scaiue or totally fails, it can only exist by becoming adapted...extinction. He domesticates animals which serve him either to capture food or for food itself, and thus changes of any great extent in his teeth or digestive...

...necessity of doing this will react upon his mental organisation and social condition—will advance thetn while his natural body remains naked as before. When...extinction. He domesticates animals which serve him either to capture food or for food itself, and thus changes of any great extent in his teeth or digestive...

...some animal becomes scarce or totally fails, it can only exist by becoming adapted to a new kind a,. food, a food perhaps less nourishing and less digestible....extinction. He domesticates animals which serve him either to capture food or for food itself, and thus changes of any great extent in his teeth or digestive...

...however, it is prohable that this cannot be done ; the internal organs may not vary quick enoxigh, and then the animal will decrease in numbers, and finally become extinct. If a larger or more powerful beast is to be captured and devoured — as when a carnivore, which has...

...structure of his body will remain unchanged. So when a glacial epoch comes on, some animals must acquire warmer fur, or a covering of fat, or else die of cold....extinction. He domesticates animals which serve him either to capture food or for food itself, and thus changes of any great extent in his teeth or digestive...