Tremors and agitation ensued, and the patients screamed out violently, and tossed their heads about from side to side.

As the complaint increased it seized the arms, and its victims beat their breasts, clasped their hands, and made all sorts of strange gestures.

The observer who gives this account remarked that the lower extremities were in no instance affected.

In some cases exhaustion came on in a very few minutes, but the attack usually lasted much longer, and there were even cases in which it was known to continue for sixty or seventy hours.

Many of those who happened to be seated when the attack commenced bent their bodies rapidly backwards and forwards during its continuance, making a corresponding motion with their arms, like persons sawing wood.