VI ADVERTISEMENT. 



whatever loss this may have occasioned to myself, 

 it has caused no loss to the public. A part of 

 these inquiries at least, has been most success- 

 fully pursued by others, and especially the 

 labours of Orfila, Christison, and Taylor have 

 extended our knowledge of the destructive 

 agency of poisons far beyond the limits of my 

 original investigations. 



October 23. 1851. 



