Final answer:
The author argues that examples like population comparisons and water classification demonstrate potential vagueness in empirical judgments, emphasizing that even seemingly clear categories can reveal vagueness.
Step-by-step explanation:
The author's argument regarding vagueness in empirical properties is that the examples provided, such as population comparisons and water classification, demonstrate potential vagueness in empirical judgments.
The author contends that even seemingly clear categories, when examined closely, reveal vagueness. The author emphasizes that the definition of vagueness may depend on human purposes and that the potential for vagueness remains, especially when considering real-world scenarios and human judgments.
The discussion concludes by acknowledging that categories are tools rather than exact representations of experience.