Those who show the human quality are still more in number. They can be divided into three classes: there is the humane quality, there is the animal quality and there is a devilish quality. This is shown by the rate of their vibrations and their rhythm. Intense rhythm produces the devilish quality, moderate rhythm shows the animal quality, even rhythm shows the humane quality. The form of these rhythms may be explained thus: the humane quality is mobile, the animal quality is uneven, the devilish quality is zigzag.