That use of Posh below is not just an archaic one, it's an archaic one that came up last night in conversation. The OED we consulted said it means a mush, as slivered crushed ice. We thought that was weird. The meaning "fancy" didn't come into common use until the early 20th century, more or less, but it is suggested that it meant that as early as the 1890s. Hell, you can read it your own self. The meaning we found is curiously absent from that link.
Also, out of the meeting with friends last night: we stopped by Half Price books on Guadaloupe, where I purchased a complete leather-bound set of (formerly) loose-leaf encyclopedias from 1932. The whole set cost $10. They're bound together with wood on the spine, and rivits through the pages. It has a certificate of Encyclopedic Usefulness or some such garbage in the front of the first volume. All in all, a pretty cool set. If I ever need pre-WWII knowledge, I have a source. Rock on.