This last volume has a good list of the magazines currently being published; Some of these, e.g. The Evangelist, Boys and Girls, Across the Seas, we don't currently have any of.

This page; http://www.victorianperiodicals.com/series3/single_sample.asp?id=127826 gives some info on Boys and Girls .. seems to be a run at the British Library, so maybe they will appear on Google one day.

Another interesting page with some info on these; http://davidwilkinnwpzambia.com/brethren-articles-1907-1940s/