Mesorat%20hashas for Chullin 110:33

חרותה בידי אדם טרפה רבי שמעון בן אלעזר אומר

He went and enquired about them at the college, and was told the following: In summer one must take white glazed basins, fill them with cold water, and leave the lungs therein for a period of twenty-four hours; if they return to their normal state it is a sign that it was caused by an act of God, and they are permitted, otherwise they are trefah.

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