Not every reader of this blog already knows the history of typography, so I thought it might be worthwhile to discuss a curious fact that many readers must have noticed about printing in the 18th century.
Basically, what is the deal with the 
fs (
effs) in place of 
s?
The short answer is that it isn't an 
f at all, but a "long 
s." Happily, there is a good discussion of the issue on 
Wikipedia. Short answer:
The long, medial or descending f (s) is a form of the minuscule letter s that was formerly used when the s occurred within or at the beginning of the word, for example finfulnefs ("sinfulness"). The modern letterform was called the terminal or short s.
Incidentally, the long 
s was never identical with an 
f in any of the fonts in use. It is just that in modern fonts the long 
s doesn't exist, so here I am using an 
f to represent it.
How was it used? The short answer is: never at the end of the words, always in the middle and sometimes at the beginning. Thus, you will find examples like this: 
sufpicious and 
fufcipious but never 
fufpiciouf.
A question that might immediately spring to mind is, isn't that stupid? I mean, the letter form looks so much like an 
f! The answer is basically, yes, it was a little silly and potentially confusin--and eventually the practice was stopped. But the truth is that many letters resemble one another. Take 
u and 
v or 
h and 
n or 
q and 
g (well, in some fonts anyway!) or 
o and 
0 or some forms of 
i and 
l and on it goes. Truth is, these are all easily confused (or confufed) with one another. Or take Hebrew, which is also full of letters that resemble each other. Examples: 
ר/ 
ד, 
ב/
כ, 
ו/
ז, 
ע/
צ ,
ג/
נ are all confusing for someone just learning Hebrew, no different than 
ح/
خ are when learning Arabic.
So 
f/f is just another quirky example, long since corrected. In fact, one of the interesting things I think will be apparent in this blog is that one can see the evolution of the long 
s from the beginning to the end of the 18th century. Pay attention to the dates of the examples I post and this will be apparent.