By James Gillray. In this etching, he caricaturised a lecturer – most likely physician and chemist Thomas Garnett, as administering gas at London’s Royal Institution to a particularly long-winded member of parliament, Sir John Coxe Hippisley. Squeezing the bellows next to the pair is the grinning future Sir Humphry Davy. Just over a week after Hannah Humphrey published Gillray’s etching, Davy would replace Garnett as the Royal Institution’s Lecturer of Chemistry. Source.  Over to the left, toward the bottom, there appears to be an interracial couple with a child. Click for full size!

New Discoveries in Pneumaticks!: or an Experimental Lecture on the Powers of Air, James Gillray, Etching coloured, 1802. Subject: New Discoveries, Equipment, Supplies, Teaching.