ADVERTISEMENT. 



Since the publication of the first edition of this 

 Work, a great number of vahiable additions 

 have been made to our knowledge of Physiology 

 in its various departments. These I have in- 

 serted in their proper places in the present 

 edition ; in which I have also made several 

 alterations necessary to adapt it to the present 

 advanced state of the science. 



P. M. R. 



Bernard Street, Russell Square, 

 August 1st, 1840. 



