hat Ingenious
Discourse written by _Sanctorius_, [2] I was resolved to direct my
self by a Scheme of Rules, which I had collected from his
Observations. The Learned World are very well acquainted with that
Gentleman's Invention; who, for the better carrying on of his
Experiments, contrived a certain Mathematical Chair, which was so
Artifically hung upon Springs, that it would weigh any thing as well
as a Pair of Scales. By this means he discovered how many Ounces of
his Food pass'd by Perspiration, what quantity of it was turned into
Nourishment, and how much went away by the other Channels and
Distributions of Nature.

Having provided myself with this Chair, I used to Study, Eat, Drink,
and Sleep in it; insomuch that I may be said, for these three last
Years, to have lived in a Pair of Scales. I compute my self, when I am
in full Health, to be precisely Two Hundred Weight, falling short of
it about a Pound after a Day's Fast, and exceeding it as much after a
very full Meal; so that it is my continual Employment, to trim the
Ballance between these two Volatile Pounds in my Constitution. In my
ordinary Meals I fetch my self up to two Hundred Weight and [a half
pound [3]]; and if after having dined I find my self fall short of it,
I drink just so much Small Beer, or eat such a quantity of Bread, as
is sufficient to make me weight. In my greatest Excesses I do not
transgress more than the other half Pound; which, for my Healths sake,
I do the first _Monday_ in every Month. As soon as I find my self duly
poised after Dinner, I walk till I have perspired five Ounces and four
Scruples; and when I discover, by my Chair, that I am so far reduced,
I fall to my Books, and Study away three Ounces more. As for the
remaining Parts of the Pound, I keep no account of them. I do not dine
and sup by the Clock, but by my Chair, for when that informs me my
Pound of Food is exhausted I conclude my self to be hungry, and lay in
another with all Diligence. In my Days of Abstinence I lose a Pound
and an half, and on solemn Fasts am two Pound lighter than on other
Days in the Year.

I allow my self, one Night with another, a Quarter of a Pound of Sleep
within a few Grains more or less; and if upon my rising I find that I
have not consumed my whole quantity, I take out the rest in my Chair.
Upon an exact Calculation of what I expended and received the last
Year, which