2015 年 38 巻 p. 27-41
Hume establishes the first principle in his study of human nature: ʻall our simple ideas proceed ... from their correspondent impressionsʼ（T 184.108.40.206）. It is so primary for his empiricism that based on it, he argues about space and time, a necessary connection between cause and effect, and even vice and virtue. But then why does he present the missing shade of blue as a contradictory example to it? In this paper, I will start by describing the resemblance thesis and the causal thesis involved in his first principle. I will then explain why the missing shade of blue is not a counterexample to the former thesis, but to the latter. Finally, I will argue why he does present the missing shade of blue though it does not affect his first principle.