Volume 32, Issue 1, April 2006
Rolf George
Pages 141-166
James Jurin Awakens Hume from His Dogmatic Slumber. With a Short Tract on Visual Acuity
After a discourse about the literature on visual acuity before Hume, I discuss how the “size” of visual objects is defi ned and determined. I shall then
present circumstantial, but commanding, evidence for the infl uence of James Jurin’s Essay upon Distinct and Indistinct Vision on Hume’s thought. This work
contains well-supported findings incompatible with claims made in T 1.2, “Of the ideas of space and time,” and elsewhere. Specifically, the prominent
principle of the Treatise, “[w]hat consists of parts is distinguishable into them, and what is distinguishable is separable” (T 1.2.1.3; SBN 27) is shown to be
false. A powerful principle, it is a premise to the most important arguments of the Treatise, but is shunned in the Enquiry and later writings because, I believe,
Hume had read Jurin.