IV PREFACE. 



t 



Emerson Tennent and Messrs. "Worms, who kindly lent 

 me original drawings and photographs whilst the micro- 

 scopic representations of pure and adulterated coffee and 

 chicory are copied, by permission, from Dr. Hassall's ela- 

 borate work on "Food and its Adulterations." Trusting 

 that this little work may be found useful and interesting 

 to a large class, I send it forth as the pioneer of other 

 hand-books on the great staples of commerce. 



P. L. S. 



8, Winchester-street, S.W., 

 July, 1864. 



