Robert Morrison, the first Protestant missionary in China published a "Vocabulary of the Canton Dialect" (1828) with a rather unsystematic romanized pronunciation. Elijah Coleman Bridgman and Samuel Wells Williams in their "Chinese Chrestomathy in the Canton Dialect" (1841) were the progenitors of a long-lived lineage of related romanizations with minor variations embodied in the works of James Dyer Ball, Ernst Johann Eitel, and Immanuel Gottlieb Genăhr (1910). Bridgman and Williams based their system on the phonetic alphabet and diacritics proposed by Sir William Jones for South Asian languages.