On Mon, 05 Aug 2013 02:25:20 -0400, micky
wrote:

I remember reading a recommendation that when caulking the base of a
toilet, to leave an inch in the back uncaulked, so that leaking would
show up on the floor, to be fixed.

Some toilets have a "notch" in the back just for this purpose; in case
the bowl develops and internal crack and the leak becomes known to the
owner. The notch is shaped like a half-moon.

Never caulk that section.

Toilet tanks may also have them on the back of the tank. If the flush
valve breaks or constantly fills, water will drain out on the back of
the tank.

I prefer to caulk the bottom of the toilet. Others may not.