Originally published in 1916, &quot;Sex=The Unknown Quantity&quot; by Ali Nomad is, as described by its author, &#39;<i>a new and startling interpretation of the meaning, scope and function of sex as seen and interpreted from the inner or cosmic standpoint. A work that should revolutionize the thought of today in its relation to the vital mystery of sex in all its aspects. It presents a practical solution to the sex problems of everyday life.</i>&#39;<br /><br /><b><i>Ali Nomad</i></b> was a pseudonym of Alexander J. McIvor-Tyndall, a British hypnotist, showman and speaker.