London, Chatto & Windus, 1927. First Edition. First Impression. Hardback. A near fine copy, in the jacket. Haldane was the brother of Naomi Mitchison and husband of Charlotte Haldane (it's not often you get to introduce a 1920s book written by a man by referencing two female authors!) Charlotte Haldane's seminal A Man's World is advertised to the rear. Possible Worlds is a collection of essays, mostly scientific, but tailing off toward the speculative near the end; though not fictional. The jacket is complete and just a little toned. All in all a fine copy. 4pp ads to rear. [8867, Hyraxia Books].