O

Obligation of penal laws (1676)

Observationes medicae (1667-1670)

Observations on Mr. Bolds papers (1698)

Of enthusiasm [1695?]

Of ethick in general [c. 1686-87?]

Of God’s justice (1680)

Of seeing all things in God (1693)

Of study (1677)

Of the 4 constitutions (1675)

Of the Association of ideas (1695?)

Of the Conduct of the Understanding [1695?]

Of the difference between civil and ecclesiastical power (1674)

Oleum (1679)  M 

On allegiance and the revolution [1690]

On enthusiasm (1682)

On ideas and knowledge (1681)

On identity of persons (1683)

On knowledge of God (1682)

On laws (1681)

On reason, passion, and superstition (1981)

On religion (1681)

On Samuel Parker (1669)

On the idea of God (1680)

On the immortality of the soul (1682)

On the Labadists (1684)

On the priesthood of Christ [date unknown]

On translating Nicole (1677)

On William Sherlock’s The case of allegiance … [1690 or 91]

Opinion (1679)

Organs of Speech (1694?)

Outline for The reasonableness of Christianity [1695?]