The attitudes of animals in motion, illustrated with the zoopraxiscope

by Eadweard Muybridge

The Rack or Pace.

The rack differs from the trot in the nearly synchronous action of the laterals instead of the diagonals.

In some countries the rack is naturally adopted by the horse as one of his gaits, but it is probably caused by the effects of training exercised over many generations of his ancestors.

The movements already described are regular in their action, and a stride may be divided into two parts, which are essentially similar to each other.