er ideas associated with these, and not of those excited by
external irritations or by voluntary exertion. Hence the patients do not
know the room which they inhabit, or the people who surround them; nor have
they any voluntary exertion, where the delirium is complete; so that their
efforts in walking about a room or rising from their bed are unsteady, and
produced by their catenations with the immediate affections of pleasure or
pain. See Section XXXIII. 1. 4.

By the above circumstances it is distinguished from madness, in which the
patients well know the persons of their acquaintance, and the place where
they are; and perform all the voluntary actions with steadiness and
determination. See Sect. XXXIV. 2. 2.

Delirium is sometimes less complete, and then a new face and louder voice
stimulate the patient to attend to them for a few moments; and then they
relapse again into perfect delirium. At other times a delirium affects but
one sense, and the person thinks he sees things which do not exist; and is
at the same time sensible to the questions which are asked him, and to the
taste of the food which is offered to him.

This partial delirium is termed an hallucination of the disordered organ;
and may probably arise from the origin of one nerve of sense being more
liable to inflammation than the others; that is, an exuberance of the
sensorial power of sensation may affect it; which is therefore thrown into
action by slighter sensitive catenations, without being obedient to
external stimulus, or to the power of volition.

The perpetual flow of ideas in delirium is owing to the same circumstance,
as of those in our dreams; namely, to the defect or paralysis of the
voluntary power; as in hemiplagia, when one side of the body is paralytic,
and thus expends less of the sensorial power, the limbs on the other side
are in constant motion from the exuberance of it. Whence less sensorial
power is exhausted in delirium, than at other times, as well as in sleep;
and hence in fevers with great debility, it is perhaps, as well as the
stupor, rather a favourable circumstance; and when removed by numerous
blisters, the death of the patient often follows the recovery of his
understanding. See Class I. 2. 5. 6. and I. 2. 5. 10.

Delirium in diseases from inirritability is sometimes preceded by a
propensity to surprise. See Class I. 1. 5. 11.

M. M. Fomentations of the shaved head for an hour repeatedly. A blister on
the head. Rising