THESE STUDIES IN NATURAL HISTORY 



ARE DEDICATED TO 



THE VENERATED MEMORY 



OF MY FATHER, 



JOHN McCOOK, 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. 



