Bush-Brown: Heredity 1n Horses 217 
LUMBAR VERTEBRAE OF “LEXINGTON,” THE FAMOUS THOROUGHBRED 
The Thoroughbred is a breed of horses descended from the Arab. The skeleton of Lexington, in 
the National Museum at Washington, shows six lumbar vertebrae. The sixth vertebra inclines 
backward instead of forward and is reduced in size, and has intermediate characteristics 
lumbar and partly sacral. 
ancestors. (Fig. 18.) 
‘ s—partly 
This shows an atavistic tendency toward the five vertebrae of the Arab 
a 
ie fe B 
; eel ; 
as Pe oe ee 
ee 
This racer has a longer back than the Arab. ‘ 
Hogarth’s line of beauty” is shown well in the neck. 
(Fig. 19.) 
