Note 63 — DON JUAN CANTO THE FIRST.[14]
Reading edition
{50} [The reference is to the metallic tractors of Benjamin Charles Perkins, which were advertised as a "cure for all disorders, Red Noses," etc. Compare English Bards, etc., lines 131, 132—
"What varied wonders tempt us as they pass! The Cow-pox, Tractors, Galvanism, and Gas."
See Poetical Works, 1898, i. 307, note 3.]