I came across your posting regarding Cuairtear Chloinn Cholla on Brad McCall's blog and followed it across to this forum. As it happens, I have a copy of No 25 which I will be happy to scan and send to you either as a PDF or set of JPEGS as you prefer.
I would probably send it to you via sendthisfile.com if you give me your email address.
For anyone who wants to see the originals, there are full sets in the Mitchell Library, Glasgow and in the Edinburgh City Library (Scottish Library section), and the National Library of Scotland.
I have tried searching the Michell's online catalog and also those of other libraries for other material relating to the MacColl Society but with no luck.