TO 



THOMAS WATSON, M.D., F.RS. 



PRESIDENT OF THE ROYAL COLLEGE OF PHYSICIANS 



THESE LECTURES 



HONOURED AT THE TIME OF THEIR DELIVERY 



BY HIS 

 FRIENDLY EXPRESSIONS OF INTEREST AND APPROVAL 



ARE NOW 

 WITH HIS KIND PERMISSION 



RESPECTFULLY AND GRATEFULLY DEDICATED 



BY 

 HIS OBLIGED SERVANT 



THE AUTHOR 



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