 In 1903, Peirce gave a series of lectures at Harvard, and at The Lowell Institute. Part of these lectures was an account of signs. However, the 1903 account of signs showed considerable developments to the early account of the 1860s. First, where the early account suggested three classes of sign, the 1903 account suggests ten classes of sign. Second, where the account the 1860s treats the general sign, or symbol, as the main focus of sign theory, the 1903 account counts many more sign types as within the focus of philosophy and logic. Third, Peirce dropped the claim that an infinite chain of signs precedes any given sign (see Short 2004, 221–2).