280 
KNAPP'S CHEMICAL TECHNOLOGY. 
LVII.— CHEMICAL TECHNOLOGY, OR CHEMISTRY APPLIED 
TO THE ARTS AND MANUFACTURES. By Dr. F. Knapp, 
Professor at the University of Giessen. Translated and Edited, with 
numerous notes and additions, by Dr. Edmond Ronalds, Lecturer 
on Chemistry at the Middlesex Hospital, and Dr. Thomas Richardson, 
of New Castle-on-Tyne. First American Edition, with notes and 
additions by Prof. Walter R. Johnson, of Philadelphia. Vol. 1. 
Illuminated, with 214 engravings on wood. Philadelphia: Lea & 
Blanchard, 1848. pp. 504. 
The application of correct scientific principles to the 
processes of manufacturing is one of the noblest functions 
of the student of abstract science, because his labours have 
a direct bearing in improving the facilities of life in large 
communities. By the deductions of such a mind, a hitherto 
worthless product, or even noxious residue, is turned into a 
valuable agent in the economy of society, and the mass are 
doubly benefitted. For a long period, the modus operandi 
of most kinds of manufacture was kept secret, or at least 
no works were generally accessible which would enable 
the unitiated to enter into their pursuit. No journals for 
the promotion of the mechanic and scientific arts were 
known (as now conducted) for a long period, and the mys- 
teries of the manufactory were preserved with the most 
jealous watchfulness, both on the part of principals and 
subordinates. Whilst this disposition continued, slow pro- 
gress was made in the steps towards perfection. 
Things have changed now, and manufacturers depend 
more on patents and the influence of large capital, well 
knowing that the cheaper an article of general consumption 
can be fabricated, the larger will be the demand. It is with 
pleasure, therefore, that we announce the republication 
here of the experience of Europe, especially when under 
the superintendence of capable men. 
