Henry Drummond was a Scottish evangelist, biologist, writer and lecturer. His biography is found in several Internet sites, most notably Wikipedia.The Unity tract, Maternity Treatments, recommends that expectant mothers read Henry Drummond's "Love: the Supreme Gift" each day during her seventh month of pregnancy. Eric Butterworth, in his series on Antecedent's of New Thought, recommends Henry Drummond's book "Natural Law in the Spiritual World."
The following is from Eric Butterworth's Antecedents of New Thought, clip 151:
He grew up in his home with several books that were about all he really had around this rather poor home circumstance. One was the Bible, and one was a big story of the Bible which had huge pictures, and another was a little work, which I'm delighted to discover was a part of his background and, it was a book of Henry Drummond which was called Natural Law in the Spiritual World. Henry Drummond I always consider as one of my gurus.
He was a Scottish preacher/scientist in a day when there was a great barrier between religion and science and so he was a phenomenon. He taught physics at the University of Edinburgh and at the same time was a pastor of one of the large churches there; Church of Scotland. Very brilliant individual and wrote many essays. Many of you are aware of his classic essay on love which has certainly been a popular one but you may not be aware that he wrote a lot of essays. Some of which I find to be classics in their field. Anyway, this essay of his on natural law in the spiritual world is a way of trying to bring together the fields of religion and science and he does it in a very interesting way. I suspect this had a great influence on Ernest Holmes and I suspect that this instead of the fact that it was a take off of Christian Science was why he used the term "Religious Science" and "Science of Mind." I think he was dealing with the idea of science as a very viable, practical way of dealing with life in a spiritual sense.