A confused singing in the ears followed me, wherever I went.

On going to bed the very stairs seemed to dance up and down under me, so that, misplacing my foot, I sometimes fell.

Talking too, if it continued but half an hour, exhausted me, so that profuse perspirations followed; and the same effect was produced even by an active exertion of the mind for the like time.

These disorders had been brought on by degrees in consequence of the severe labours necessarily attached to the promotion of the cause.

For seven years I had a correspondence to maintain with four hundred persons with my own hand.