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 of South America. As Huxley wrote: "I do not know where one is to look for contributions to palæontology more varied, more numerous, and, on the whole, more accurate, than those which Owen poured forth in rapid succession between 1837 and 1888."

Owen remarks in his Comparative Anatomy and Physiology of the Invertebrate Animals, 1855, p. 639, that physiology is dependent on comparative anatomy, but the idea is not applicable at the present day, as physiology is dependent on chemistry and physics. In later life he knew this, and greatly appreciated the work of others, as the following letters to the author bear evidence:—