4 11 
Geology . 
Shew this to a chemist, and he will see at once that ac- 
cording to the modem system of manufactures, to pro- 
duce this sample, there is required 
1st, The knowledge necessary to erect a steam engine, 
with all the acquirements previously necessary. 
2dly, The mechanical knowledge necessary to erect 
and put in order the complicated machinery for carding, 
roving, spinning, and twisting cotton. 
3diy, The knowledge necessary to the weaving of it 
into cloth, which under the patent of the Rev. Mr. Cart- 
wright is in England now performed by the power of wa- 
ter or of steam ; and in the course of a twelve month will 
be so performed in this country. I hear it has been done 
in Boston, and I saw it done with additional improve- 
ments by Mr. Siddal’s loom about six miles from Phila- 
delphia on the York road. 
4thly, The chemical knowledge necessary to bleach 
the goods to a marketable whiteness. Including the know- 
ledge of alkalies, the method of making and employing 
oil of vitriol, to which lead works and glass works are ne- 
cessary : and the method of making and employing, the 
oxymuriatic acid and its alkaline and earthy combina- 
tions. 
5thly, The knowledge necessary to the machinery of a 
print shop and its attendant branches : as 
a. The pattern drawer, to whom is paid from a guinea 
to a guinea and a half a week, and whose sole employ- 
ment is the inventing and the drawing of patterns on pa- 
per. This introduces the trade of colour- making ; itself 
implying no slight degree of chemical knowledge and ex- 
perience. 
b . The block cutter; and finisher who fixes the hat 
or felting on the block when cut. 
c. The fabricator of copper plates, ai)d of turned cop- 
per rollers. 
