When a word had two s's together, writers usually made the first one long and the second one round: ſs. Written fast, the two letters run together into a single shape that looks like "fs", like the German ß, or like a p with a tail. You will meet it in everyday words such as witness, Congress, possessed and necessary, and in names like Massachusetts and Bliss.
This habit lasted longer than the single long s. Many clerks still wrote "ſs" in the 1830s and 1840s, long after they had stopped using ſ anywhere else. Whenever you see "fs" or "ß" in the middle or at the end of an English word, read it as ss.











