When I Heard the Learn'd Astronomer Isolation Quotes
How we cite our quotes: (line)
Till rising and gliding out, I wander'd off by myself,
In the mystical moist night-air, (lines 6-7)
Despite his solitude, he feels much less alone once he goes outside the lecture room. The line separating humanity and the natural world dissolves, and he feels a close connection with the night, symbolized by the vapor (moisture) that permeates the air.