I've found myself having to look up the translations and then realized there would be no easy way for a reader to easily access translations when these stories were written. Were the foreign language portions included as simply a means of showing Holmes' brilliance or was there something more to it? I know very little about the Victorian period and thus don't know the intellectual expectations with which Doyle was working.
As a follow up question, the first Sherlock Holmes short stories and 2 of the novels were first published (or serialized) in the Strand Magazine, was the readership average in terms of literacy or was is aimed at more highly educated readers?
Edit - Sorry the first 3 volumes of short stories were published in the strand. That paragraph implied all of them were.