THESE STUDIES IN NATURAL HISTORY 



ARE DEDICATED TO 



THE VENERATED MEMORY 



OF MY FATHER, 



JOHN M( COOK, M. D, 



A LOVER OF NATURE, A FRIEND OF SCIENCE, 



A GOOD PHYSICIAN, A SERVANT OF 



HIS FELLOW MEN 



WHOSE FAITH IN THE UNSEEN 



NEVER FALTERED. 



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