ADVERTISEMENT. 



THE following LETTERS were published, about 

 twelve months since, in the METROPOLITAN MA- 

 GAZINE ; and are now reprinted in a regnlar and 

 improved form. 



In presenting 1 this New Edition to the Public, 

 the author has been governed by several conside- 

 rations. The primary one is, his desire to supply 

 several things which escaped attention, in first pre- 

 paring the Letters for the Press, at stated pe- 

 riods, when his mind was often occupied with the 

 duties of his profession. Another motive was, his 

 wish to comply with the solicitations expressed, 

 not only by the author's personal friends, but also 

 with those communicated to him by letter from 

 persons residing in various parts of the kingdom. 



The author trusts, that, by exhibiting the va- 

 rious phenomena of LIFE, HEALTH, and DISEASE 



