“As my previous post on long-s left much unsaid about the origins of the long-s, which should perhaps have preceded any discussion of its rules of usage, I shall endeavour to give a brief, illustrated history of the letter “s”, culminating with my take on the eszett issue. Western paleography isn’t my area of expertise (although I do profess a certain dilettantish interest), so I expect my more learned readers to correct me where I may have inadvertently strayed from the truth.”

A fascinating reading about the long story of the various forms of the letter S and its ligatures. By Jim Bisso (I think, but it’s not perfectly clear).