376 DISEASES OF THE HORSE’S FOOT 
feet so much of the wall is isolated at the bottom that 
insufficient is left to nail the shoe to. 
The next line to be made is the rear one. Its correct 
position is ascertained by first noting the junction off the 
wall with the bar (see groove 2, Fig. 149); and its inferior 
end must be just anterior to the inflexion of the wall. This 
is done that we may avoid cutting the bar. The position 
of the lower end of the rear line thus ascertained, it is run 
upwards with the chalk in the direction of the horn fibres. 
1 2 2 
Fie, 148.—D1aGRaM ILLUSTRATING THE POSITION OF THE GROOVES IN 
THE WALL IN CoLoNEL SmirH’s OPERATION FOR SIDE-BONE. 
1,2, and 3, mark the grooves in the order in which they are made ; the dotted 
line @ marks the position taken by the anterior line when the side-bone 
is one reaching far forward, while the dotted lines 6 and ¢ mark the 
position of the additional grooves to be made if thought necessary. 
The third line is made in such a position as to divide 
into two equal portions the wall between lines 1 and 2. 
Here, however, some operators prefer to make two, or even 
three, lines, adding those as at b and c, Fig. 148; and 
Smith himself says that a multiplicity of lines is an 
advantage rather than not. 
In any case, having once determined the position of the 
lines, they should be plainly marked out with chalk, and 
then viewed from a distance with the foot on the ground, in 
