Book Club: Scientific Metaphysics, 3, Scientific vs speculative ontology

[image: Unicorn, by Bettina Rateitzak, 1962, Wikimedia; this is essay #326 in the Philosophy as a Way of Life series]

What exists, and how do we know it? The first is the fundamental question of ontology, a major branch of metaphysics. The second question is epistemological, but it is obviously crucial for the first one: without good epistemic reasons any ontological claim becomes as arbitrary as those of religion. According to Paul Humphreys, the author of the third chapter of…