[martin_fierro]

Can someone explain why, in those times, an "s" was used in one part of a fentence, and an "f" used in otherf? <|:)~

[mewzilla]

Blame Hogarth. I think he thought it was prettier.

[KarlInOhio]

Can someone explain why, in those times, an "s" was used in one part of a fentence, and an "f" used in otherf?

It's called a "Long S". It is used at the start of a word and many times in the middle, but never at the end.

http://www.usgennet.org/family/smoot/oldhand/long-s.html