E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Chambers says: An old patriarchal laird (Durham of Largo) was in the habit of regulating the time of evening worship by the appearance of the smoke of Edinburgh . When it increased in density, in consequence of the good folk preparing supper, he would say, It is time noo, bairns, to tak the buiks and gang to our beds, for yonders auld Reekie, I see, putting on her night-cap.
Yonder is auld Reekie. You may see the smoke hover over her at twenty miles distance.Sir W. Scott: The Abbot, xvii.