Discovery of Glass.
Reading edition
'As some merchants,' says Pliny, 'were carrying nitre, they stopped near a river which issues from Mount Carmel. As they could not readily find stones to rest their kettles on, they used for this purpose some of these pieces of nitre. The fire, which gradually dissolved the nitre, and mixed it with the sand, occasioned a transparent matter to flow, which in fact was nothing less than glass.'