Thanksgiving?

Ezra Pound, Instigations (New York: Boni and Liveright, 1920), p. 228:

I give thanks to Zeus ὅσις ποτ' ἐσὶν, that being an American, I have escaped the British public school.

If Pound had been educated in a British public school, perhaps he would not have mangled the quotation from Aeschylus, Agamemnon 160, so badly:

Ζεύς, ὅστις ποτ᾽ ἐστίν...

He probably misread the stigma ligature (sigma plus tau) in an old edition.