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Perception and Instinct in the Lower Animals

IN answer to Mr. George J. Romanes (NATURE, August 7) I beg to say that I particularly inquired of my friend whether he had been to or near his old house on the day the dog returned, or shortly before, and he assured me that "he had never been near it since he left." I ought to have stated this in my account of the circumstance.

I shall make no further remarks on the subject, because I believe that nothing satisfactory can be arrived at till experiments of the nature indicated in my last letter have been systematically carried out.

ALFRED R. WALLACE