 Alexander’s early monograph Locke (1908) discusses John Locke’s Essay on ethics, politics, and religion. This short book reveals Alexander’s admiration for Locke, and Lockean empiricism. Whilst this work is mainly of scholarly interest, Alexander spends one chapter “Observations on the Essay” critiquing Locke, and here Alexander reveals the bent of his own early views. For example, Alexander complains that Locke might have gone further had he applied his observations regarding the continuity of mental experience to substance (Alexander 1908: 52). This is suggestive, given that one of Alexander’s later key claims concerning spacetime—the stuff of substances—is that it is continuous.