TO 



JOHN KIDD, M.D., F.R.S. 



REGIUS PROFESSOR OF MEDICINE IN THE UNIVERSITST OF OXFORD, 

 &C. &C. 



TO WHOSE 



ZEALOUS SUPERINTENDENCE AND DISCRIMINATING TASTE 



THE RADCLIFFE LIBRARY 



OWES MUCH OF ITS PERFECTION AS A TREASURY OF 



NATURAL HISTORY, 



€i)is 33oofe, 



PRINCIPALLY WRITTEN WITHIN ITS WALLS, 

 IS RESPECTFULLY DEDICATED BY 



THE AUTHOR. 



