CALCULUS, or CALCULUS HUMANUS, in medicine, the stone in the bladder or kidneys. See MEDICINE, and SURGERY.
CALCULUS also denotes a method of computation, so called from the calculi, or counters, anciently used for this purpose. Hence,
CALCULUS SPECIALIS or LITERALIS, is the same with algebra. See ALGEBRA.
CALCULUS differentialis is a method of differencing quantities, that is, of finding an infinitely small quantity, which being taken an infinite number of times, shall be equal to a given quantity. See FLUXIONS.