To Correspondents . 
the case, I can safely promise the best information that books can 
supply. I do not undertake to confine myself strictly to the se- 
ries of the following arrangement, but I am not inclined greatly tp 
vary from it. 
History of steam engines : methods of consuming smoke . 
Manufactures dependant on copper: assaying, smelting of 
Copper ores: alloys of Copper; Chrystals of Verdigrease; Ver- 
digrease : Verditer : Green pigments prepared from copper. 
Manufactures dependant on Lead. Assaying and smelting 
of Lead ores : massicot : litharge : red lead : white lead : sugar 
of lead : refining of Lead for silver : Milled lead for boxes : al- 
loys of Lead : Shot. 
Manufactures dependant on Tin. Tinned iron plates: tin- 
ing of Copper : tinfoil : tinning of pins : Bronze : Putty. 
Manufactories dependant on Gold , Silver , and Mercury : va«* 
rious methods of gilding, silvering, and plating : assaying : parting: 
silvering of looking glasses. Alloys of these metals. 
Manufacturies dependant on Antimony and Bismuth . Pew- 
ter : white metal: Types. 
Colour making . Carmine : red lakes : yellow lakes : copper- 
brown : Lamp, Ivory, Frankfort blacks : pearl white, Spanish 
white, flake white, white from Barytes and Strontian : saxon 
blue : nankeen dye : brown, dutch and rose pinks : sap green ; 
Scheele’s green, french green, brunswick green, olympian green 
(vid. copper :) aurum musivum : ultra marine : smult : bice : cin- 
nabar : vermillion : chromat of lead and of mercury : patent 
mineral yellow : cheap paints : stencils ; coloured chalks : pannels 
for painters : oil cakes : colour mills. 
Chemical drugs in the large way. Pot and pearl ash : pure 
alkali : soda ; ammonia : oil of vitriol : spirit of salt : aqua fortis : 
cream of tartar : radical vinegar : acids of tartar : of lemons : of 
sugar : of benzoin : sulphat of potash, of soda, of magnesia : calo- 
mel : corrosive sublimate : unguent, mercur : red precipitate : 
preparations of Antimony : of Bismuth : muriat of barytes : elas- 
tic gum tubes : purification of Camphor : the common quack 
medicines : method of detecting adulteration in medicines : me- 
moir on chemical manufacturies with reference to the law of 
nuisance. 
Tanning , with the modern proposed improvements. The 
processes for making Turkey, Morocco, and Russian Leather 
Dying and staining Leather, 
