The commencement, however, of his reign was such as by no means
prognosticated its subsequent transition. The sudden change of his
conduct, the astonishing mixture of imbecility and presumption, of moral
turpitude and frantic extravagance, which he afterwards evinced; such as
rolling himself over heaps of gold, his treatment of his horse Incitatus,
and his design of making him consul, seem to justify a suspicion that his
brain had actually been affected, either by the potion, said to have been
given him by his wife Caesonia, or otherwise. Philtres, or love-potions,
as they were called, were frequent in those times; and the people
believed that they operated upon the mind by a mysterious and sympathetic
power. It is, however, beyond a doubt, that their effects were produced
entirely by the action of their physical qualities upon the organs of the
body. They were usually made of the satyrion, which, according to Pliny,
was a provocative. They were generally given by women to their husbands
at bed-time; and it was necessary towards their successful operation,
that the parties should sleep together. This circumstance explains the
whole mystery. The philtres were nothing more than medicines of a
stimulating quality, which, after exciting violent, but temporary
effects, enfeebled the constitution, and occasioned nervous disorders, by
which the mental faculties, as well as the corporeal, might be injured.
That this was really the case with Caligula, seems probable, not only
from the falling sickness, to which he was subject, but from the habitual
wakefulness of which he complained.

(294) The profusion of this emperor, during his short reign of three
years and ten months, is unexampled in history. In the midst of profound
peace, without any extraordinary charges either civil or military, he
expended, in less than one year, besides the current revenue of the
empire, the sum of 21,796,875 pounds sterling, which had been left by
Tiberius at his death. To supply the extravagance of future years, new