THE EQUILIBRIUM. ^j 



and in unison the motion is awkward and 

 uneven, and both are hampered and con- 

 strained by the want of uniformity of 

 speed and stride. If the man in front 

 walks more rapidly than his fellow he not 

 only carries his own share of the burden 

 but has the drag of his slower bearer, 

 while if the man in the rear moves at the 

 more rapid pace he not only takes upon 

 himself additional labor but even disturbs 

 and harasses the man before him. 



But when both men move with equal 

 step and equal speed the weight is evenly 

 and properly distributed, and the move- 

 ment is easy and regular. 



In a like manner the two extremities 

 of the horse must be brought to work 

 together to insure a uniform, light and 

 regular movement ; and this can only be 



