The 18th Century Collection contains approximately 4000 volumes printed 1700-1799. The collection covers a variety of subjects including aspects of the penal system, education and the constitution. Highlights include the famous treatise by the English philosopher and enlightenment thinker John Locke, Some thoughts concerning education ( 1772) in which Locke applies his theories of the self and the mind to approaches to education and The state of the prisons in England and Wales: with preliminary observations and an account of some foreign prisons and hospitals (1784) by the English philanthropist and prison reformer John Howard, detailing his findings after visiting several hundred prisons across England, Scotland and Wales, in a series of reports, maps and plans.

The 17th Century Collection is a small but expanding collection of books printed 1600-1699. The books it contains are a good reflection of this period as a time of rebellions, intrigues and conspiracies; hierarchical power; and strong religious views. Sermons and speeches were commonly printed.