"Interval" is the space between two horses who are standing or going forward on parallel lines.
All movements are executed singly or in file: in the first case each pupil goes through the movement, without regard to the others; in the second, the pupils execute the movement in turn after the leaders of the column.
A movement in file, once known, may be repeated individually, but only at a walk in the beginning, in order to insure attention. The columns should both be on the right hand; consequently the head of one will be opposite the end of the other as they are drawn up on their respective sides. First order:
1. _Prepare to go forward._--2. _Go forward._
When the final word of command is given, the pupils will advance simultaneously, each one using the same effects as if she were alone, and being careful to preserve the correct distance.
The two leaders should so regulate the gait of their horses as to pass the opposite corners of the school at the same moment, and this gait should be uniform. If a pupil loses her distance, she should regain it by making her horse walk faster; but she should try to keep her place, as the whole column must quicken its pace when she does, and all suffer from the carelessness of one.
When the columns are on the short sides of the school, the teacher should give the order:
When they are again going forward, always on the right hand, the order should be given:
1. _Prepare to turn to the right._--2. _Turn to the right._
At the final order each pupil will turn to the right on her own account, and according to the rules already prescribed; at the end of this movement all will find themselves on parallel lines, and about twelve feet apart; they should then turn the head somewhat to the right, in order to see that they are on the same line, and cross the width of the school in such a way that the columns will meet and pass each other in the middle. When they have reached the opposite side, they will turn to the right without further order, the leaders at the end of the column being now at its head. This movement should _never_ be executed except at a walk.
To replace the columns in their accustomed order, the teacher should have this movement executed a second time. When the columns are going forward on the right hand, the order will be given: