My first sensation was an universal and considerable tremor. I then
perceived some giddiness in my head, and a violent dizziness in my
sight; those sensations by degrees subsided, and I felt a great
propensity to bite through the wooden mouth-piece, or the tube of the
bag through which I inspired the air. After I had breathed all the air
that was in the bag, I eagerly wished for more. I then felt a strong
propensity to laugh, and did burst into a violent fit of laughter, and
capered about the room without having the power of restraining myself.
By degrees these feelings subsided, except the tremor which lasted
for an hour after I had breathed the air, and I felt a weakness in my
knees. The principal feeling through the whole of the time, or what
I should call the characteristical part of the effect, was a total
difficulty of restraining my feelings, both corporeal and mental, or in
other words, not having any command of one’self.