from perceptions._ 8. _Variety of scenery in dreams, excellence of the
sense of vision._ 9. _Novelty of combination in dreams._ 10.
_Distinctness of imagery in dreams._ 11. _Rapidity of transaction in
dreams._ 12. _Of measuring time. Of dramatic time and place. Why a dull
play induces sleep, and an interesting one reverie._ 13. _Consciousness
of our existence and identity in dreams._ 14. _How we awake sometimes
suddenly, sometimes frequently._ 15. _Irritative motions continue in
sleep, internal irritations are succeeded by sensation. Sensibility
increases during sleep, and irritability. Morning dreams. Why
epilepsies occur in sleep. Ecstacy of children. Case of convulsions in
sleep. Cramp, why painful. Asthma. Morning sweats. Increase of heat.
Increase of urine in sleep. Why more liable to take cold in sleep.
Catarrh from thin night-caps. Why we feel chilly at the approach of
sleep, and at waking in the open air._ 16. _Why the gout commences in
sleep. Secretions are more copious in sleep, young animals and plants
grow more in sleep._ 17. _Inconsistency of dreams. Absence of surprise
in dreams._ 18. _Why we forget some dreams and not others._ 19.
_Sleep-talkers awake with surprise._ 20. _Remote causes of sleep.
Atmosphere with less oxygene. Compression of the brain in spina bifida.
By whirling on an horizontal wheel. By cold._ 21. _Definition of
sleep._

1. There are four situations of our system, which in their moderate degrees
are not usually termed diseases, and yet abound with many very curious and
instructive phenomena; these are sleep, reverie, vertigo, drunkenness.
These we shall previously consider, before we step forwards to develop the
causes and cures of diseases with the modes of the operation of medicines.

As all those trains and tribes of animal motion, which are subjected to
volition, were the last that were caused, their connection is weaker than