In this communication it is proposed—

(I.) To relate three cases of general paralysis in which localized copious perspiration affected one side only of the face and head, and to mention a fourth case in another insane patient.

(II.) Next to refer to some other cases of unilateral sweating mentioned by authors, but not occurring among the insane; and

(III.) Lastly, to speak of the pathology of this symptom. I. By reference to the subjoined notes, it will be seen that the unilateral perspiration of the face occurred under dissimilar conditions in the three cases of general paralysis; in one, without any local paralysis or convulsion, but associated with old-standing disorganisation of the eyeball of the same side; in another, occurring sometime after a peculiar change in the mental state, and at first with very slight and very transitory unilateral facial paralysis; while in the third the unilateral perversion of secretion accompanied unilateral convulsions and hemiplegia of the corresponding side. All these patients were soldiers.