24 The Trotting and the Pacing Horse 



suction, so called, behind the pace-maker cer- 

 tainly withdraw a large part of the 30 pounds' 

 pressure that would otherwise oppose the horse. 

 The dirt-shield pace-maker shields the horse 

 behind in the same way that the Reliance in 

 the windward position effectually blanketed the 

 Shamrock, though the two were more than 

 20 lengths apart ; and yet some horsemen claim 

 that only when the pace-follower is less than one 

 length behind is he assisted to any extent." 



The truth or falsity of these conclusions can 

 easily be demonstrated in 1904 by Lou Dillon, 

 Major Delmar, Dan Patch, and other horses who 

 performed with shields in 1903. 



