TO 



JOHN FLEMINa, D.D., 



PEOFESSOE OP NATITEAI; SCIENCE, NEW COLLEGE, EDINBURGH, 



AND 



aEOEGE JOHNSTON, M.D., LL.D., 



FELLOW OF THE EOYAL COLLEGE OF SUEGEONS OF EDINBTJEGH, 



E])iQ Hittle Voluvxz 



IS 



WITH GEEAT ESTEEM AND AFFECTION 



DEDICATED 



BY THEIE GEATEFTJL FEIEND, 



.^- -THE AUTHOE. 



