From Fallen London Wiki

i've been building up a pile of memories from trading in my <a href="/wiki/Experiment_with_a_Discordant_Soul" title="Experiment with a Discordant Soul">discordant souls</a>, which if you're sufficiently discordant you can get one of each week from the nadir. gives you 66.6E worth of souls and an anchorhold memory (and 5 parabolan research) for 1 discordant soul and a level of glasswork. i had a whole pile of discordant souls built up before i got around to figuring out what to do with them, so now by the time i've traded them all in i am going to have a whole pile of memories instead to dispose of.