THE HUMAN BEAST OF BURDEN. 295 



it would be a fascinating task to note the thousand and one devices 

 by means of which mankind have shifted their burdens upon the backs 

 of animals, upon the winds and the waters. The authorities of the U. S. 

 National Museum have organized a section of Transportation and ap- 

 pointed to the curatorship Mr. J. E. Watkins, to whom I shall leave the 

 task of working out the subsequent chapters in the history of this 

 subject. 



