By the way, the suggestion of using that directory was a very good one.  Although I have not yet found the studio of L. Peters, photographer, I did find the name of the man in the photo, Jacob Ludwinowsky, in one of the directories and was able to obtain his occupation.  So that was new and interesting information!
Kind regards,
Lorraine Fig Shapiro
Ann Arbor, MI
Researching LUDWINOWSKY/I  and SLADOWSKY/I (East Prussia and Suwalki province, Poland).