The first case was one of putrid bronchitis, with chronic ulcerating pneumonia. The first paralytic symptom was weakness, with increase of temperature and sweating in the right arm, followed next day by almost complete motor paralysis of this limb. On the third day the arm was convulsed, and subsequently the whole body was seized with tetanic spasms, causing opisthotonism (three attacks). In a few days the inferior branches of the facial became paralysed on the right side. Next the speech was affected, and lastly came motor paralysis of the right leg. The patient, without looking, had no idea in what position his right limbs lay. During this short time rapid atrophy of theright arm had taken place.