4 PREFACE. 



We have confined ourselves to such foreign improve- 

 ments in the Chemical Arts, whether patented or not, 

 as we beheved the American artisan might avail him- 

 self of, frequently offering critical remarks on them, 

 and sometimes pointing out where improvements were 

 likely to be made. 



We trust that the work will prove useful to that por- 

 tion of the public more exclusively interested in the 

 arts, and not less acceptable to men of science, as ex- 

 hibiting the contemporaneous advancement of science 



and art. 



J. C. B. and C. M. 



Philadelphia, July, 1851. 



