This volume is worth having and it’s back in print.
R. Scott Clark

R.Scott Clark is the President of the Heidelberg Reformation Association, the author and editor of, and contributor to several books and the author of many articles. He is professor emeritus of church history and historical theology at Westminster Seminary California, where he taught for 29 years. He also taught at Wheaton College, Reformed Theological Seminary, and Concordia University. He has hosted the Heidelblog since 2007 and the Heidelcast since 2009.
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Dr. Clark,
Thanks for pointing out this book. Colquhoun is one of my favorite theologians, yet he is forgotten by most. I recently wrote a post about him at Feeding on Christ. Your readers can find it at http://feedingonchrist.com/2009/04/09/john-colquhoun-an-evangelical-calvinist-to-be-remembered/
There are many free Colquhoun books on Google Books and Internet Archive.
Thanks again!