Diary of John Quincy Adams, volume 1
This day at about 2 o'clock P.M we left Riga, and arriv'd at a village call'd Neuermuhlen at about half past 4, here we are obliged to stop because we found all the horses were gone away; The road is sandy from Riga here, and the land bad.
JQA and Dana remained in Riga over the weekend (18–19 Aug.) in order to obtain the passport mentioned in the previous Diary entry (Dana, Journal).