Mysticism and Metaphysics seem to share immediate similarity: both amount to sort of speculations pertaining to capture universal truth that cannot be confirmed nor refuted by the senses. What is the distinction between mysticism and metaphysics? 

In my search for some answer I explored Bertrand Russell's "Mysticism and Logic", an essay first published in 1917. However, in that essay, the relation between metaphysics and mysticism is somewhat unclear to me, and further - Russell limited the role of both mysticism and metaphysics in the practice of doing philosophy (since he wanted philosophy to be more scientific).