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and gallops ten steps to the left. On the twentyfirst step it returns to the right-hand lead; and so on.

The difficulty is for the rider to keep count of the steps, since the air demands for its correct performance that the number shall always be exactly the same. Moreover, at its best, the movement requires the change of lead at every step — one stride with lead to the right, then the change to the left, then one stride with lead to the left, and again the change back to the right, thus continuing indefinitely. Naturally, this demands thorough training for the horse and the highest equestrian tact from the rider.

Both Baucher and Fillis have performed this air with remarkable evenness of rhythm. Fillis, also, once upon a time, laid a heavy wager with certain amateur horsemen, who denied the possibility of the gallop a tempo, that he would ride from the Arc de Triomphe to the Place de la Concorde, with a change of lead after every step. The grand master won.

In training a horse for this air, the change of lead should be at first only once in every twenty steps. Afterwards, with the greatest patience and moderation, the number is reduced progressively. The exercise demands great energy from the horse, which must throughout remain perfectly calm. Whatever the number of steps between changes of lead, this must always remain unvaried.