Temperament may be defined as that quality, made manifest by the physical and mental characteristics of man. There are four distinct types of temperament: The nervous, the sanguine, the bilious, and the lymphatic. To these I will apply the term primary, because they are the base of all the combinations or compounds met with in the majority of people. A pure type of any one temperament is not often found, and when it is the characteristics are very marked. For the purpose of my paper it is necessary that I describe each temperament separately, and then take up the various compounds as they present themselves. Before taking up this description, I would state that I shall differ from all the authors that I have been able to consult, in that I shall consider, not only the skin, the eyes, the hair, and the contour of the face as they do;