"Published February 1906" stated on copyright page; Houghton, Mifflin and Company publishers, Boston and New York; smaller hardbound; good condition with pages intact and solid; original owners name typed and scripted (very nice) in front (pic); very minor foxing of pages; no dust jacket.
 
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Ostwald, Professor of Physical Chemistry at the University of Leipzig, was Temporary Professor at Harvard University when he delivered this lecture. The Nobel Prize in Chemistry 1909 was awarded to Wilhelm Ostwald 'in recognition of his work on catalysis and for his investigations into the fundamental principles governing chemical equilibria and rates of reaction.'.