Discoveries respecting other material Substances.-Progress of Chemistry.
Discoveries respecting Electricity, Magnetism, Light, Heat.
Mechanical Philosophy and Inventions.-Physical Instruments.-The Re-
sult illustrated by the Cotton Manufacture-Steam-Engine-Bleaching
-Canals-Railways.-Improvements in the Construction of Machinery.
-Social Changes produced.-Its Effect on Intellectual Activity.
The scientific Contributions of various Nations, and especially of Italy. . 354
ERRATUM.-Page 57, line 13 from bottom, for "two external principles," read