Grice's quip ("stone-age physic") -- Russell's earlier quip ("stone-age metaphysic"): "the metaphysics of the stone age to which common sense is due".

Speranza

It all even occasioned on Russell's part a caustic quip about "the metaphysics of the stone age to which common sense is due.

Grice: "the PHYSICS OF THE STONE AGE to which common sense (and English, for that matter) is due."