Page:The Harveian Oration,1902.djvu/55

 constriction and high-tension pulse. This is borne out, not only by experiments on normal individuals, but by observations on the morbid states of joy and sadness in the typical forms of insanity.

The vascular dilatation of pleasurable states of mind signifies also a more active circulation and exaltation of all the vital processes—dynamic and metabolic—while the opposite condition obtains in states of mental pain. Conversely, also, given the vascular and corporeal state arising spontaneously or induced artificially, usually associated with any particular mood, trains of thought and states of feeling corresponding therewith are apt to arise in consciousness. This, in all probability, as Lange indicates, is the origin of the use of stimulants and nervines of various kinds, which all nations and at all times have dis-