RELATION OF ANIMALS ‘tO MAN 27 
One reason why the early people of America failed to develup 
us did those in the Old World was because there were no domestic 
animals of any consequence on the -\merican continent. True, they 
had the dog, but this animal was of little use in subjugating the 
forces of nature like the horse and ox were for the people of Asia, 
Africa and Europe. 
Not only have animals furnished motive power directly, but they 
have served to furnish this power in other forms. The application 
of oil, gas and coal to mechanical devices, wheeled vehicles and man- 
made motors has come about largely from the ability of domestic 
animals to do certain difficult tasks that man unaided by them would 
TEDDING Hay IN SWITZERLAND 
Efficiency of labor is one of the most important factors in the progress and pros- 
perity of North America. 
have found impossible of accomplishment, even though his mental 
insight would have indicated a way. Civilization and human de- 
velopment are most due to the animals that have carried burdens 
and moved things. 
8. Animals as a source of clothing.—Animals have en- 
abled man to conquer nature, not only by adding their 
force to his relatively weak body, but they have furnished 
him clothing which has made it possible to extend his 
habitat. Skins effectively gave him warmth and protec- 
tion before the days of manufacture, and today leather 
is in greater use than ever in our history. Although rela- 
tively less extensively used than formerly, silk and wool, 
both animal products, possess qualities found in no other 
