Percival Leigh, Manners and customs of ye Englyshe… (1849)
“ Dabbes the great Chemist, with whom some pretty Discourfe concerning the Air of crowded Rooms, which he said do contain a Gas called Carbonic Acid, and is poisonous, and we were now breathing so much per Cent, of it, which did trouble me. To think what Delight fashionable Folks can take in crowding together, to the Danger of Health, a Set of People, for the most Part, Strangers both to them and to one another! ”
