I'd like to ask about the sentence below from Conan Dolye's Sussex Vampire.
Faithfully yours, MORRISON, MORRISON, AND DODD. per E.J.C.
This is from the letter Sherlock Holmes got from a (some kind of) law firm. Can anyone tell me what this "per E.J.C." in the last part means? If this "per" means like "through", then does this "E.J.C." represent someone's name (person in charge)? If so, why wouldn't this person spell out their name instead of the abbreviated form? If it's a formal letter using such term as "Faithfully, yours". Does that mean this person is in such terms as Holmes will easily tell by who he got the letter from with only those initials? Or, does this E.J.C mean the name of a mail company that sent this message to Holmes or something? Or Is this the abbreviated name for some medium I don't know? If that is the case, Is this "per" working in the same way as in "by ship, by car"? Can someone elaborate this for me? Thanks.