recur with exacerbation of the pain and
fever about sun-set, at which time venesection is of most service. The same
may be observed of the inflammatory rheumatism, and other fevers with
arterial strength, which seem to obey solar periods; and those with
debility seem to obey lunar ones.

8. The periods of fevers with arterial debility seem to obey the lunar day,
having their access daily nearly an hour later; and have sometimes two
accesses in a day, resembling the lunar effects upon the tides.

9. The periods of rhaphania, or convulsions of the limbs from rheumatic
pains, seem to be connected with solar influence, returning at nearly the
same hour for weeks together, unless disturbed by the exhibition of
powerful doses of opium.

So the periods of Tussis ferina, or violent cough with slow pulse, called
nervous cough, recurs by solar periods. Five grains of opium, given at the
time the cough commenced disturbed the period, from seven in the evening to
eleven, at which time it regularly returned for some days, during which
time the opium was gradually omitted. Then 120 drops of laudanum were given
an hour before the access of the cough, and it totally ceased. The laudanum
was continued a fortnight, and then gradually discontinued.

10. The periods of hemicrania, and of painful epilepsy, are liable to obey
lunar periods, both in their diurnal returns, and in their greater periods
of weeks, but are also induced by other exciting causes.

11. The periods of arterial haemorrhages seem to return at solar periods
about the same hour of the evening or morning. Perhaps the venous
haemorrhages obey the lunar periods, as the catamenia, and haemorrhoids.

12. The periods of the haemorrhoids, or piles, in some recur monthly, in
others only at the greater lunar influence about the equinoxes.

13. The periods of haemoptoe sometimes obey solar influence, recurring early
in the morning for several days; and sometimes lunar periods, recurring
monthly; and sometimes depend on our hours of sleep. See Class I. 2. 1. 9.

14. Many of the first periods of epileptic fits obey the monthly lunation
with some degree of accuracy; others recur only at the most powerful
lunations before the vernal equinox, and after the autumnal one; but when
the constitution has gained a habit of relieving disagreeable sensations by
this kind of exertion, the fit recurs from any slight cause.

15. The attack of palsy and apoplexy are known to recur with great