Well that explains something!

"As a proof that it is as I say, persons affected with calculus have
very limpid urine, because the thickest and foulest part remains and
is concreted. Thus it generally is in cases of calculus."

So calculus gives you kidney stones...

That explains that!

Apparently drinking bad water, the stomache gets "heated" and the bladder gets "heated" as a result, which of course heats the urine.

And with the heated urine, the purest parts of it are secreted (returned to the body), the lightest parts are excreted, but the heaviest parts congregate and become concentrated.

And this congregation is...a kidney stone.

Because of calculus.

Because of calculus.

Oh it was by Hippocrates by the way.


Note: actually what Hippocrates uses the term "calculus" as a synonym for kidney stone, but...it's too funny NOT to pass up.