First published in English periodicals, chiefly the quarterly reviews, and issued in London with several other papers, under the title of "Essays, scientific, political and speculative", first and second series, 1857-1863. cf. Pref.

Progress : its law and cause -- Manners and fashion -- The genesis of science -- The physiology of laughter -- The origin and function of music -- The nebular hypothesis -- Bain on the emotions and the will -- Illogical geology -- The development hypothesis -- The social organism -- Use and beauty -- The sources of architectural types -- The use of anthropomorphism.

Retrospective conversion record: BSLW database.