Abstract
Conformance with a threshold limit may lead to more absorption of vapor than does conformance with a numerically identical maximal acceptable concentration, because the former is a time-weighted average concentration', while the latter is a limit below which all measurements should fall. The adverse effects which threshold limits are expected to guard against may not include cortical reflexes. Whether or not such reflex effects are of any importance to the well-being of the industrial worker is not completely clear.

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